Merge changes from topic 'one-test-server'
* changes:
Unset global capabilities after use in acceptance tests
ActionsIT: Use distinct topic names for each test method
Use distinct group and user names per project in acceptance tests
AccountCreator: Cache accounts by name rather than recreating
Use distinct project names for each acceptance test method
PushOneCommit: Use fresh commit timestamp
PushOneCommit: Clean up assert methods
Synchronize InMemoryRepositoryManager methods
Support AutoValue annotation processors via exported_deps
