Merge branch 'stable-4.2'

* stable-4.2:
  FileTreeIteratorTest: Open Git and RevWalk in try-with-resource
  RebaseCommandTest: Open RevWalk in try-with-resource
  PullCommandTest: Open RevWalk in try-with-resource
  BlameGeneratorTest: Create Git instances in try-with-resource
  Remove unnecessary suppression of deprecation warnings in tests
  DiffEntryTest: Open Git and TreeWalk in try-with-resource
  DiffCommandTest: Open Git and RevWalk in try-with-resource
  CommitCommandTest: Open Git and TreeWalk in try-with-resource

Change-Id: Ic886ec9b1a4b3b46f9fa14188b4df832ce36cfa6
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>