* draft
* expose internal admin port and add proxy test
* update tests
* move comment
* add failure case, fix lint issues
* cleanup
* handle error
* revert changes to service interface
* address review comments
* fix merge conflict
* merge the tests so cluster is created once
* fix other test
- remove dep on consul main module
- use 'consul tls' subcommands instead of tlsutil
- use direct json config construction instead of agent/config structs
- merge libcluster and libagent packages together
- more widely use BuildContext
- get the OSS/ENT runner stuff working properly
- reduce some flakiness
- fix some correctness related to http/https API