[MLS people2] Implemented people2 filter for MLS using single group by people queries.
* [SCR] Removed repositories metric from filters metrics. repositories of repositories give an error.
* [tests] Updated SCR json files to remove repositories metric.

Merge branch 'master' of github.com:VizGrimoire/GrimoireLib

Conflicts:
	vizgrimoire/metrics/query_builder.py