fixes #4463 - use unattended URL for hostgroup provisioning

Fixes #3260- Allows puppet to manage value of smart class parameter that can be overrided

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 #3309 - Support deep merging of hash and array structures in smart class parameters

Fixes #7830 - interfaces api output is class specific

- per type rabl templates
- fixed api docs for interfaces

fixes #7372 - API v2 - accept PUT/POST requests with wrapped root node to add/remove has_many associations of child nodes

fixes #3492 - API v2 nested routes for each controller

fixes #7332 - Host Create API documentation missing required parameters

refs #7401 - fix markdown syntax in API doc

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