fixes #14665 - support IPv6 via API

Fixes #7230, #12021 - Upgrade to Rails 4.1.5

This commits upgrades Rails to Rails 4.1.5. See a description of the
changes included here, and go to the pull request in GitHub to see more
detailed explanations:

• Update gems to a Rails 4 compatible version, including dependencies...

Fixes #7463 - Add basic support for bridges

Fixes #9657 - merge NICs from compute profile in host create API

- updated api docs for hosts and interfaces
- host create/update api actions now merge interfaces from compute
profiles
- NIC type mapping extracted into a separate class
- return full host detail after host update

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 #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

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 #3491 - API v2 rabl templates base, main, show for each controller

fixes #2931 - API v2 hosts JSON response, add *_name for each *_id