* stable-3.1:
Update git submodules
Update git submodules
Update git submodules
Update git submodules
Elasticsearch: Remove support for EOL 6.6 version
ElasticContainer: Upgrade V7_8 to elasticsearch 7.8.1
ElasticContainer: Upgrade V6_8 to elasticsearch 6.8.11
Fix gr-hovercard-behavior under Firefox
Add entries to .gitignore of stable-3.0 that exist on master
Change-Id: I4c28a0671f3927b99f01639e80fc7bfbd3059213