SyncWAL() before Close() when FLAGS_avoid_flush_during_shutdown=true in crash test (#12900)

Summary:
**Context/Summary:**
When we use WAL and don't flush data during shutdown `FLAGS_avoid_flush_during_shutdown=true`, then we rely on WAL to recover data in next Open() so will need to sync WAL in crash test. Currently the condition is flipped.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/12900

Test Plan:
Below fails with data loss `Verification failed. Expected state has key 000000000000015D000000000000012B0000000000000147, iterator is at key 000000000000015D000000000000012B0000000000000152` before the fix but not after the fix
```
./db_stress --WAL_size_limit_MB=0 --WAL_ttl_seconds=0 --acquire_snapshot_one_in=10000 --adaptive_readahead=1 --adm_policy=3 --advise_random_on_open=1 --allow_concurrent_memtable_write=0 --allow_data_in_errors=True --allow_fallocate=1 --async_io=1 --auto_readahead_size=1 --avoid_flush_during_recovery=0 --avoid_flush_during_shutdown=1 --avoid_unnecessary_blocking_io=0 --backup_max_size=104857600 --backup_one_in=1000 --batch_protection_bytes_per_key=8 --bgerror_resume_retry_interval=100 --block_align=0 --block_protection_bytes_per_key=4 --block_size=16384 --bloom_before_level=0 --bloom_bits=10 --bottommost_compression_type=disable --bottommost_file_compaction_delay=3600 --bytes_per_sync=262144 --cache_index_and_filter_blocks=1 --cache_index_and_filter_blocks_with_high_priority=0 --cache_size=33554432 --cache_type=tiered_auto_hyper_clock_cache --charge_compression_dictionary_building_buffer=1 --charge_file_metadata=0 --charge_filter_construction=0 --charge_table_reader=0 --check_multiget_consistency=0 --check_multiget_entity_consistency=0 --checkpoint_one_in=1000000 --checksum_type=kxxHash64 --clear_column_family_one_in=0 --column_families=1 --compact_files_one_in=1000000 --compact_range_one_in=1000000 --compaction_pri=3 --compaction_readahead_size=0 --compaction_style=1 --compaction_ttl=0 --compress_format_version=1 --compressed_secondary_cache_ratio=0.3333333333333333 --compressed_secondary_cache_size=0 --compression_checksum=1 --compression_max_dict_buffer_bytes=0 --compression_max_dict_bytes=0 --compression_parallel_threads=8 --compression_type=zlib --compression_use_zstd_dict_trainer=0 --compression_zstd_max_train_bytes=0 --continuous_verification_interval=0 --daily_offpeak_time_utc= --data_block_index_type=1 --db=/dev/shm/rocksdb_test/rocksdb_crashtest_whitebox_2 --db_write_buffer_size=0 --default_temperature=kUnknown --default_write_temperature=kWarm --delete_obsolete_files_period_micros=30000000 --delpercent=4 --delrangepercent=1 --destroy_db_initially=1 --detect_filter_construct_corruption=0 --disable_file_deletions_one_in=1000000 --disable_manual_compaction_one_in=10000 --disable_wal=0 --dump_malloc_stats=0 --enable_checksum_handoff=0 --enable_compaction_filter=0 --enable_custom_split_merge=0 --enable_do_not_compress_roles=0 --enable_index_compression=1 --enable_memtable_insert_with_hint_prefix_extractor=0 --enable_pipelined_write=0 --enable_sst_partitioner_factory=0 --enable_thread_tracking=1 --enable_write_thread_adaptive_yield=1 --error_recovery_with_no_fault_injection=0 --exclude_wal_from_write_fault_injection=1 --expected_values_dir=/dev/shm/rocksdb_test/rocksdb_crashtest_expected_2 --fail_if_options_file_error=1 --fifo_allow_compaction=1 --file_checksum_impl=none --fill_cache=0 --flush_one_in=1000000 --format_version=5 --get_all_column_family_metadata_one_in=1000000 --get_current_wal_file_one_in=0 --get_live_files_apis_one_in=10000 --get_properties_of_all_tables_one_in=100000 --get_property_one_in=1000000 --get_sorted_wal_files_one_in=0 --hard_pending_compaction_bytes_limit=274877906944 --high_pri_pool_ratio=0.5 --index_block_restart_interval=13 --index_shortening=1 --index_type=2 --ingest_external_file_one_in=0 --initial_auto_readahead_size=524288 --inplace_update_support=0 --iterpercent=10 --key_len_percent_dist=1,30,69 --key_may_exist_one_in=100000 --last_level_temperature=kHot --level_compaction_dynamic_level_bytes=0 --lock_wal_one_in=10000 --log2_keys_per_lock=10 --log_file_time_to_roll=60 --log_readahead_size=16777216 --long_running_snapshots=0 --low_pri_pool_ratio=0.5 --lowest_used_cache_tier=0 --manifest_preallocation_size=0 --manual_wal_flush_one_in=0 --mark_for_compaction_one_file_in=0 --max_auto_readahead_size=0 --max_background_compactions=1 --max_bytes_for_level_base=67108864 --max_key=100000 --max_key_len=3 --max_log_file_size=1048576 --max_manifest_file_size=1073741824 --max_sequential_skip_in_iterations=16 --max_total_wal_size=0 --max_write_batch_group_size_bytes=16 --max_write_buffer_number=3 --max_write_buffer_size_to_maintain=8388608 --memtable_insert_hint_per_batch=0 --memtable_max_range_deletions=0 --memtable_prefix_bloom_size_ratio=0.01 --memtable_protection_bytes_per_key=4 --memtable_whole_key_filtering=1 --memtablerep=skip_list --metadata_charge_policy=1 --metadata_read_fault_one_in=0 --metadata_write_fault_one_in=0 --min_write_buffer_number_to_merge=1 --mmap_read=0 --mock_direct_io=True --nooverwritepercent=1 --num_file_reads_for_auto_readahead=2 --open_files=100 --open_metadata_read_fault_one_in=0 --open_metadata_write_fault_one_in=8 --open_read_fault_one_in=0 --open_write_fault_one_in=0 --ops_per_thread=200000 --optimize_filters_for_hits=1 --optimize_filters_for_memory=1 --optimize_multiget_for_io=0 --paranoid_file_checks=0 --partition_filters=0 --partition_pinning=1 --pause_background_one_in=1000000 --periodic_compaction_seconds=0 --prefix_size=1 --prefixpercent=5 --prepopulate_block_cache=0 --preserve_internal_time_seconds=0 --progress_reports=0 --promote_l0_one_in=0 --read_amp_bytes_per_bit=0 --read_fault_one_in=0 --readahead_size=16384 --readpercent=45 --recycle_log_file_num=1 --reopen=20 --report_bg_io_stats=1 --reset_stats_one_in=1000000 --sample_for_compression=0 --secondary_cache_fault_one_in=32 --secondary_cache_uri= --skip_stats_update_on_db_open=1 --snapshot_hold_ops=100000 --soft_pending_compaction_bytes_limit=68719476736 --sqfc_name=foo --sqfc_version=2 --sst_file_manager_bytes_per_sec=104857600 --sst_file_manager_bytes_per_truncate=0 --stats_dump_period_sec=0 --stats_history_buffer_size=0 --strict_bytes_per_sync=1 --subcompactions=3 --sync=0 --sync_fault_injection=1 --table_cache_numshardbits=6 --target_file_size_base=16777216 --target_file_size_multiplier=1 --test_batches_snapshots=0 --top_level_index_pinning=0 --uncache_aggressiveness=4404 --universal_max_read_amp=-1 --unpartitioned_pinning=2 --use_adaptive_mutex=0 --use_adaptive_mutex_lru=1 --use_attribute_group=0 --use_delta_encoding=1 --use_direct_io_for_flush_and_compaction=1 --use_direct_reads=1 --use_full_merge_v1=1 --use_get_entity=0 --use_merge=0 --use_multi_cf_iterator=1 --use_multi_get_entity=0 --use_multiget=1 --use_put_entity_one_in=0 --use_sqfc_for_range_queries=1 --use_timed_put_one_in=0 --use_write_buffer_manager=0 --user_timestamp_size=0 --value_size_mult=32 --verification_only=0 --verify_checksum=1 --verify_checksum_one_in=1000 --verify_compression=1 --verify_db_one_in=10000 --verify_file_checksums_one_in=0 --verify_iterator_with_expected_state_one_in=5 --verify_sst_unique_id_in_manifest=1 --wal_bytes_per_sync=0 --wal_compression=none --write_buffer_size=33554432 --write_dbid_to_manifest=1 --write_fault_one_in=0 --writepercent=35

```

Reviewed By: anand1976, ltamasi

Differential Revision: D60489038

Pulled By: hx235

fbshipit-source-id: fb35889ae1509eb1bac27b015bb24a07d3b95268

db_stress_tool/db_stress_test_base.cc

@@ -3676,7 +3676,7 @@ void StressTest::Reopen(ThreadState* thread) {
   // crash-recovery verification does. Therefore it always expects no data loss
   // and we should ensure no data loss in testing.
   // TODO(hx235): eliminate the FlushWAL(true /* sync */)/SyncWAL() below
-  if (!FLAGS_disable_wal && !FLAGS_avoid_flush_during_shutdown) {
+  if (!FLAGS_disable_wal && FLAGS_avoid_flush_during_shutdown) {
     Status s;
     if (FLAGS_manual_wal_flush_one_in > 0) {
       s = db_->FlushWAL(/*sync=*/true);