Merge branch 'stable-3.0'
* stable-3.0:
Remove unused deprecateGwtUi parameter
Update git submodules
Export more libraries needed by review-assistant plugin
PutHttpPassword: Add comment to prevent accidental removal of method
Revert "PutHttpPassword: Squash apply methods"
Update reviewnotes plugin revision
Error Prone: Fix DefaultCharset in ListProjectsIT
Bazel: Enable Error-Prone by default
Parallelize account migration in schema 146 migration
Fix _nextStepHandle not being assigned a value when scrolling
Elasticsearch: Remove redundant handling of 'ignore_unmapped' property
Elasticsearch: Fix support for V6 versions earlier than 6.7.*
Clarify introduction to external IDs
ExternalIdNotes: Improve grammar in checkState messages
Update git submodules
Add example of external ID key in external ID documentation
Minor grammatical fixes in external ID documentation
ElasticVersionTest: Add missing assertions on V6_7
Bazel: Fix exporting Mockito in plugin API
Change-Id: I06a0c5856930a9dd0dbeef31741618d95a91dd2f
