Anton/sync groups and verticals

This fixes https://openedx.atlassian.net/browse/BLD-1095

NB: before merge `ENABLE_GROUP_CONFIGURATIONS` should be set to default value.

Please review: @tymofij  @cahrens 

@explorerleslie Sandbox is http://studio.auraz.m.sandbox.edx.org/
@christina @cahrens Good point with publishing state, thank you. I'm OK with your proposals and I will contact Leslie.
Me and Tim discussed it and I've reworked code to update display name of active group to be actual without save. I think It is bit better - as active groups will be synced. But of inactive groups default name with group id will be shown. As soon I will commit, I will ping you.