Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  Set version to 2.14.13
  ElasticContainer: Use Elasticsearch 5.6.12 for V5_6 tests

Change-Id: I65dc172892f6a5217b1db26e9bab288c530aefd0
tree: ac86f880b7ca6961c309ef034d547dd2ab8d1780
  1. gerrit-acceptance-tests/
  2. gerrit-elasticsearch/
  3. gerrit-pgm/