Merge branch 'stable-2.15'

* stable-2.15:
  Remove redundant type arguments
  Avoid creating unnecessary array
  Adjust tests
  Enable more compiler warnings in Eclipse
  ForwardedIndexingHandler: Make doDelete abstract
  JGroupsPeerInfoProvider: Remove unnecessarily nested else block
  ForwardedCacheEvictionHandler#evict: Fix Javadoc
  Remove class PeerInfoProvider
  Make PluginConfigPeerInfoProvider a singleton
  Adjust queue names to match core Gerrit convention

Change-Id: Iefdad3c75af7e701018daa5010faefc126e9bab2