Initial code drop for sssd ldap integration
Add missing system dataset icon

Ticket: #5068
Update dependencies
Option to apply default windows permissions added to share page

Ticket: #5079
No chmod for you

Ticket: #5070
Merge branch 'feature/sssd'

Conflicts:
	gui/common/freenasldap.py
LDAP works, yay.
Generate rsync command line from python

This will allow us to grow a "run now" feature avoiding code
duplication.

Ticket:	#5061
Add a comment about rsync notifier method
Comment about new rsync notifier method
Allow scheduled rsync to be executed "now"

Ticket:	#5061
Run rsync from GUI as the specified user
Add a new API endpoint to run the rsync job
Document new rsync run endpoint
Fix a few HTTP return status code in the docs
Update windows datasets to use restricted aclmode

Ticket: #5070
Add ability to remove DOSATTRIB EA
Be explicit about ea and dos attributes
When using a thor hammer, clear out dos attributes
-x outside of the quotes or die