Add 9.2-RELEASE jails to upcoming 9.2.0 release

- Rename existing warden templates for pre-9.2.0 jails to appropriate
  version
- Add get_avatar_conf() function to common/system.py
- Add warden functions to determine FreeBSD version and architecture for
  templates
- Bugfix for get_jails_index(), use 'x86' instead of 'x32'
Bugfix: Don't reassign t to be the model object ;-)
If no mac address is configured, set it to the first one generated
Add arp entries for all jail IP addresses
Merge remote-tracking branch 'github/pootle'
Try to log everything to syslog in english

Most of the translations strings are not yet lazy, so it won't work.

Ticket:	#3544
Do not log MiddlewareError as error or it will be in the console

Ticket:	#3544
Place the error messages place at the top, next to the logo

Ticket:	#3545
Allow localization of the ZFS volume manager

Ticket:	#3543
Change URL for TrueNAS

Ticket:	#1920
Set vdev to stripe even for multiple vdevs with single disks

Ticket:	#3525
Update release notes with geli improvements.
Update relnotes about the iSCSI fixes.
Add a checkbox allowing to disable automatic upload if crash dumps

Ticket:	#3531
Do a case insensitive search for plugin names
Force configuration of a default gateway for plugins and jails to work

Ticket: #3460
Ticket: #2492
Use translations ;-)
Remove unused array.
Change GenericIPAddressField() to IPAddressField()

Ticket: #2492
If a jail is a plugin, don't allow it to be deleted on the jails page

Ticket: #3549