Fixes #13091 - Paginate VMs for supporting compute resources

Loading all VMs for the compute resource view can be a very heavy task,
which leads to timeouts when attempting to load all VMs for a compute
resource that has many hundreds or thousands of VMs. This patch allows...

fixes #14239 - when creating host from API, set first interface as primary if none set

Refs #14204 - safer libvirt bridge detection

Fixes #14240 - added :server_type attribute to API rabl

Fixes #14237 - Missing tag for hosts/welcome.html.erb

fixes #13066 - Improve readability of blank slate pages

Increase font size and reduce width of description of blank slate pages
to improve readability.

fixes #14225 - add missing require for Resolv

Setting itself is explicitly required too, which will provide a better
error message in future for this and similar issues loading the class.

Fixes #13757 - spilt layout helper into two helpers

Layout helper is too large, all the forms logic moved to form helper

Fixes #10183 - Added a default results transformation for status action

fixes #14200 - exclude form templates from select2 initialisation

Form templates shouldn't be initialised with select2, as the elements
are copied through add_child_node, e.g. when adding a new external user
group inside the user group form. add_child_node calls select2 after...