Add pxe_loader to host REST

Add the field `pxe_loader` to the GET part of the hosts/
It is possible to set or update (POST, UPDATE), but not to read it

(cherry picked from commit b9f27ad9cb25862180793820eee5210cdc49ff75)

fixes #18574 - add ip6 address to the REST api results

(cherry picked from commit 71eb7ee0731726d41d76b839c56db0330e895187)

refs #18468 - move compute_resources JS to compute profile index

The CR JS should always be ready and loaded on the compute profile
index, as the new attributes form is rendered into the existing page
after the profile is created.

Because the new attributes form is loaded via the two-pane #content...

Fixes #18468 - Include JS in libvirt compute profile form

When the form is loaded via XHR the needed JavaScript
is not loaded and selecting of certain attributes fail.
(cherry picked from commit ec7fc1bd9f6ec77a90287f77092ad1f57fc92790)

Fixes #18040 - URL escape PuppetCA CN on proxy view

If the CN contains characters that cannot be displayed in an URL, like
'mcollective/OL=mcollective', the puppetca list will not be able to
render.

The reason is that Rails cannot generate an URL for such CNs, so we need...

Fixes #18126 - Fix security groups select for EC2 form

(cherry picked from commit 7f2f792808b0d8523db87278edd2ddaeef120f6b)

templates - sync from community-templates

Fixes #4519, #9531 - Correctly handle invalid host name changes

Removing a host name or otherwise changing it to an invalid name (such
as a name containing /) caused the form to fail loading. This makes sure
all paths are generated correctly and validation error is shown....

Fixes #16782 - reset dhcp record cache after mac change

(cherry picked from commit 969832057c5ea6a1f84eaf5c53f5cdc7ee445af2)

Fixes #17808 - fix 'multipart form data' IE bug

According to this bug
(https://connect.microsoft.com/IE/Feedback/Details/868498),
multipart form data is malformed if there are fields without names.
This bug has been solved within Edge browser,
however no solution is expected for IE10/IE11...