[tops] Converted all get_top_* to _get_top_* (private methods).
[example][openstack] Migrate tops from analysis version to metrics version

And addition of specific bots for OpenStack
Merge branch 'master' of https://github.com/VizGrimoire/GrimoireLib
[DataSource bots] If not it automator bots are empty. Fixes #3887
Merge branch 'master' of github.com:VizGrimoire/GrimoireLib
[times_tickets.py] Added get_ts so the study is included in its_evolutionary.json.
[ITS ticket times] Added tickets times to its_evolutionary.json
[DataSource] If a study return None, support it.
[top issues] Implemented create_report so we can execute the study from command line.
[ITS] Moved filter items implementation to Metrics classes.
Merge branch 'master' of github.com:VizGrimoire/GrimoireLib
[scm] Fix counting merges in two top authors: per project and per repository
[IRC] New tests found more diffs. Data are pretty similar so let's use the new one.
[SCM top per project] New tests found more diffs. Data are pretty similar so let's use the new one.
[compareJSON] The contents of arrays in dicts were not checked. Fixed!
Merge branch 'master' of github.com:VizGrimoire/GrimoireLib
[MLS] companies_out are removed now from MLS companies info.
[SCM Top repo and project] Minor changes in this JSON. Maybe related to ordering?
[MLS] Moved filter items implementation to Metrics classes.
[SCR] Moved filter items implementation to Metrics classes.