Fixes #15372 - Merge the correct hash when adding new volumes

Use 'attr' passed into the method and not the attrs hash on the cr.

Fixes #15344 - recover from fingerprint error on validation

Fixes #14955 - Show nice message for invalid mac, ip

Fixes #14481 - make bootable radio button checkable

Fixes #15278 - taxonomies support granular filters

fixes #15250 - ignore current controller from link_to/hash_for

When link_to generates a link on a page served from a nested controller
(e.g. foreman_example/examples) with a hash of controller/action from
our hash_for_*_path extension, it calls url_for which added the current...

fixes #14664 - support IPv6 in Nic, Hosts and Hostgroups models

Fixes #15225 - correct permission mapping for api puppet import

Fixes #15246 - correctly override array params

When editing inline array params would be parsed as js objects.
This was a result of using the jquery data api.

Fixes #8797 - Separate style from the HTML in emails

By using roadie-rails gem (1.1) style can be separated from email
html foramt, and absolute paths can be used.
style was separated to 'email.css'