There are a few different things happening in this change. First, some code that previously lived in enterprise has moved here: this includes some helper code for manipulating clusters and for building storage backends. Second, the existing cluster-building code using inmem storage has been generalized to allow various storage backends. Third, added support for creating two-cluster DR setups. Finally, there are tweaks to handle edge cases that
result in intermittent failures, or to eliminate sleeps in favour of polling to detect state changes.
Also: generalize TestClusterOptions.PhysicalFactory so it can be used either
as a per-core factory (for raft) or a per-cluster factory (for other
storage backends.)
7512a71a4c