Refs #3809 - Remove cops for empty lines

Fixes #8922 - authorized_smart_proxy_features should not fail if not implemented

Fixes #6444 - add support for virtual NICs

Extend additional interface details refs #2240

NIC facts parsing change and we create interfaces in Foreman according
to facts we recieve.

Subclasses does not define their own attributes and serialize them to
attrs hash. All BMC attributes are extracted to separate columns so it's...

Fixes #6560 - Extract puppet parsing logic

fixes #3339 - nested fact support, allow fact importers to be registered by plugins