* store directory groups separate from directory users
* fix group lookup, azure display name
* remove fields restriction
* fix test
* also support email
* use Email as name for google'
* remove changed file
* show groups on dashboard
* fix test
* re-add accidentally removed code
Storing server version when creating new server. After then, we can
retrieve the version from backend when server restart.
With storage backend which supports persistent, the server version
won't change after restarting.
