Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  ElasticContainer: Use Elasticsearch 6.4.1 for V6_4 tests
  AbstractDaemonTest: Don't delete common server path too early
  Fix toolchain definitions for bazel 0.17.1
  Bazel: Bump baseline to 0.17.1

Change-Id: Ied727b76e0bc13ab8cb8d20372514edacc56e70f
tree: be50016e2d204d6df39a0e180435c3e0e60a5a8c
  1. gerrit-acceptance-tests/
  2. gerrit-elasticsearch/
  3. gerrit-pgm/