Merge changes Ifdb33501,Idc7b7bbd,Ia3db8696,I4ef82311,I3ad58d4c, ... into stable-4.2

* changes:
  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