Fixes #2267 - general rebuild of TFTP, DNS, DHCP

Refs #11693 - APIv1 returns message when attempting deletion of Smart class parameter

Fixes #11745 - set_diff/edit_mode only if editor exists

Fixes #10805 - match vlans attached to bonds correctly

Fixes #3650, #11600 - Compute Resource availability_zones, flavors, security_groups API v2 endpoints

fixes #11715 - base64 encoded passwords must not be reencoded

Fixes #11704 - consider no reports as warning if reports are expected

Fixes #11688: default text editor to ruby.

Instead of defaulting to text, default to ruby syntax highlighting.

http://projects.theforeman.org/issues/11688

fixes #11610 - removing a bunch of N+1 queries from the migration

fixes #11473 - remove re-init of domain select2 on env selection

After an environment was selected, the reloadOnAjaxComplete function
re-initialised every select2, but other dropdowns triggered
onContentLoad which excluded those with the without_select class....