Merge branch 'stable-3.1' into stable-3.2
* stable-3.1:
Remove Hugo Arès from developers section in pom.xml files
ElasticContainer: Upgrade V6_8 to elasticsearch 6.8.10
Upgrade elasticsearch-rest-client to 7.7.1
ElasticContainer: Upgrade V7_7 to elasticsearch 7.7.1
Support /COMMIT_MSG for change edit REST endpoints
IntBlob: Add debug log when storing value on ref
RepoSequence: Add debug log when acquiring new sequence batch
Bazel: Remove version suffix from servlet-api-3_1 rule
Update no-new-changes error doc
Ignore WIP changes in "CCed on" dashboard section
Sequences: Introduce constants for configuration keys/values
RepoSequence: Add debug log of batch size
Move Flogger to nongoogle.bzl
DefaultRefFilter#canSeeSingleChangeRef: Do not fail for invalid change refs
Upgrade testcontainers to 1.14.3
Add missing documentation of notedb.changes.sequenceBatchSize
Enable rolling upgrade to next versions
Change-Id: I73cfa328b97619440f25374c0380760dd54ec646
