Merge branch 'stable-4.2'

* stable-4.2:
  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
  Remove java7 bundle from Maven central scripts
  Prepare 4.2.1-SNAPSHOT builds
  JGit v4.2.0.201601211800-r
  Add progress monitor to Merger
  Fix TransportException when reading bundle
  Fix unused throws CorruptObjectException from addTree

Change-Id: I2325fb995561a6249b7b5e82fa413dfd34ef6007
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>