Merge branch 'stable-3.2' into stable-3.3

* stable-3.2:
  Set version to 3.2.5.1
  Disk cache metrics require cache.enableDiskStatMetrics
  Set version to 2.14.22
  ElasticContainer: Upgrade V6_8 to elasticsearch 6.8.13
  Upgrade testcontainers to 1.15.0
  Update git submodules
  Workaround Gitiles bug on All-Users visibility
  Validate Gerrit changes on stable-2.15 with Jenkins
  Set version to 2.15.22-SNAPSHOT
  Set version to 3.0.16-SNAPSHOT
  Set version to 2.15.21
  Set version to 3.0.15
  Set version to 2.16.26-SNAPSHOT
  Set version to 2.16.25
  Set version to 3.1.11-SNAPSHOT
  Set version to 3.1.10
  Workaround Gitiles bug on All-Users visibility
  Workaround Gitiles bug on All-Users visibility
  Workaround Gitiles bug on All-Users visibility
  Workaround Gitiles bug on All-Users visibility
  Set version to 3.2.6-SNAPSHOT
  Set version to 3.2.5
  Workaround Gitiles bug on All-Users visibility
  Set version to 2.15.21-SNAPSHOT
  Set version to 2.15.20
  Fetch JGit documentation from the archive site
  Remove generation for c.g.gwtexpui.* JavaDoc
  Set version to 3.2.5-SNAPSHOT
  Set version to 3.2.4
  Set version to 3.1.10-SNAPSHOT
  Set version to 3.1.9
  Set version to 3.0.15-SNAPSHOT
  Set version to 2.16.25-SNAPSHOT
  Set version to 3.0.14
  Set version to 2.16.24
  Make PermissionBackend#ForRef authoritative
  Validate Gerrit changes on stable-2.15 with Jenkins
  Fix tests for stable-2.15 branch
  Make PermissionBackend#ForRef authoritative
  Make PermissionBackend#ForRef authoritative
  Make PermissionBackend#ForRef authoritative
  Verify hostname when sending emails via SMTP server with SMTPSClient
  Make PermissionBackend#ForRef authoritative
  Docs: Clarify that 'm' push option sets patch set description

Change-Id: I5f9d527fc82a92cfd1ee5aead34532c2054e9d81
tree: 1d7a961043ed72ded019437c706a85514d56f791
  1. java/
  2. javatests/