* reftable: don't check deadline on the first try
* reftable: clarify comment
* reftable: clear cache on full compaction
* reftable: remove outdated comment
* reftable: clarify that LogCursor may return a null ReflogEntry
* ConcurrentRepackTest: Don't use deprecated WindowCache.reconfigure
* ConcurrentRepackTest: Open RevWalk in try-with-resource
* CommitOnlyTest: Open RevWalk in try-with-resource
* UnpackedObjectTest: Create ObjectInserter.Formatter in try-with-resource
* FileRepositoryBuilderTest: Use try-with-resource for auto-closeables
* RepositorySetupWorkDirTest: Fix "resource leak" warnings
* cleanup: Silence an unused-parameter warning
* cleanup: Get rid of some unused-warnings
* cleanup: Remove unused parameter in ConsoleCredentialsProvider
* cleanup: Drop unused parameter on DhtPackParser
* cleanup: Remove unneeded parameter to private method in RefUpdateTest
* cleanup: Remove unnecessary @SuppressWarnings