FreeNAS Code

remove all @login_required decorators as complement of r5932

use a middleware to set login_required as a default behavior

change freeadmin to use a custom edit/add template if available;
use blocks in generic edit for extra buttons

remove legacy django.views.generic and related code;
fix some imports

Giant rollup commit in preperation for 8.0-RC4

Roll up commit from ix repo

Merge with internal repo, this will be RC1

sync up with internal repo, add support for ZFS cache, log, spares, clean up GUI

Sync with ix repo r1697, fix numerous bugs, enable treemenu, turn on mps

sync with ix repo r1526, merge in datagrid