Fixes #9044 - fixes invalid mac in tests

Also do not reset invalid mac address to nil so we can propagate proper
validation error.

Fixes #8433 - Fix type transformation for all ENC-able NICs

fixes #8377 - fixes uniq validation for nics without a host

This commit considers a nil host reference equivalent to a non-conflicting
one for the purposes of uniq_with_hosts validation.

Refs #3809 - fix shadowing outer local variables

Fixes #2089 - Add network configuration to ENC

Fixes #8005 - Convert allowed NIC types to strings

- allowed NIC type classes need to be registered now
- api for interfaces use lowercase human readable values for defining types
- fixed output of api's create action to the standard format

Fixes #7830 - interfaces api output is class specific

- per type rabl templates
- fixed api docs for interfaces

Fixes #7934 - Set correct order of require_dependency

Fixes #7401 - Add support for bonds

Renames physical_device to attached_to and move the virtual device
form out of BMC.
Extends the form for Bond devices
Allow configuration of bonds in KS template
Parsing of Bond interfaces from facts
Mac address is required only for physical devices

Refs #3809 - Remove rubocop TODOs

Removed the following TODOs so that cops for these will run from now on:

Lint/AmbiguousOperator, DefEndAlignment, DeprecatedClassMethods
EnsureReturn, RequireParentheses, Void, BlockAlignment, EndAlignment,
UselessAccessModifier,...