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 
> get_preview_view_name doesn't do anything with the module except check for the existence of a method.

I may be wrong with exact place. But after calling render display_name is changed to previous one, if it was not saved.