[core] Remove unused desktop JS libraries

Removed Farbtastic
HUE-2041 [pig] Improve log polling usage
HUE-1177 [jb] Improve MR2 UX with correct percentage progress

* Improved date/time formatting
* Resolved overstated percentages for MR2 jobs
[core] remove bad import from python util tests
[core] make suboordinate subgroups the default
HUE-2040 [useradmin] Synchronize nested ldap groups

Split up nested group and suboordinate group handling.
Add group synchronization logic in a separate method for nested groups.
Posix groups cannot have nested groups, so if it is nested,
its users are imported and we don't go any further.
NOTE: Synchronization should on assign existing users to existing groups.
[core] Add third-party dependency references