Merge branch 'stable-2.16' into stable-3.0
* stable-2.16:
Add support for Elasticsearch version 7.3.*
PrologEnvironment: Reduce "setting reductionLimit" log spam
ElasticContainer: Upgrade to 6.8.2 image for V6_8 tests
Fix typo: program
Fix email token routing
Clarify usage of 'parent' option in list files API
Remove unused Skylark patch file
Files: Use Gerrit API to get revision parents
Fix broken link for rest-api-projects.html#commentlink-info
Add support for Elasticsearch version 6.8.x
Upgrade elasticsearch-rest-client to 7.2.1
Add support for "Link Another Identity" in gr-identities
Update git submodules
CommitApi: Add method to get commit info
Consolidate all CommitApi tests into a single class
Files: Validate parent option to prevent internal server error
RevisionIT: Assert that files(base) only works for patch set revisions
Fix and expand documentation of REST API to get revision files
RevisionIT#files: Simplify assertion
Update git submodules
Update git submodules
Update git submodules
Update git submodules
Remove default bug tracker from _feedbackUrl
PG: Add shortcuts for dashboard and watched changes
PG: Allow empty label values
Remove token param from getCapabilities
Add an extension point to show a small banner next to the search bar
Fix gr-group-audit-log to use tbody
Change-Id: Idb3913a340ba3c9535ac67f5e4cc21e5f35ec39f
