fixes #6410 - update to deep_cloneable 2.0

[REFACTOR] refs #6229 - extract validation to a method

this enables plugins (e.g. katello) to override the validation when
requried.

Fixes #6337 - ensure VM tab is still visible when we deselect profile

fixes #6374 - NIC hostname now blank when domain is present, but no hostname is given

fixes #6355 - OS free text search shouldn't search associations

fixes #5939: it's no longer possible to switch tabs when compute profile is being edited.

fixes #5915 - Add support for Infiniband 64-bit MAC addresses

fixes #6248 - API V2 return object for POST/PUT/DELETE should not include root node

fixes #6216, #4416 - avoid foreign key errors when deleting some objects in use

fixes #5994: Power and Console buttons are available to non-admin users with appropriate permissions