Samba4 upgrade

- Add new samba4 choices (protocol, role, backend, forest level)
- Add proper icons in CSS
- Create Model and form for DomainController() class
- Add to view
- Add new service to service page
- Make nsswitch aware to use winbind in AD mode
- Rewrite ix-samba to use Django ORM
Samba4 glue to make samba3 work as it previously did

- notifier methods added for domaincontroller
- restart domaincontroller in form
- use correct toggle flag in domaincontroller view
- wipe out ix-samba shell code
- set pid directory in smb.conf
More samba4 glue

- Fix typo in domaincontroller notifier method
- Stop cifs before starting samba4
- Create proper samba directories when generating config
Merge branch 'samba4'

Conflicts:
	nanobsd/Files/etc/ix.rc.d/ix-samba