Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1602835

Description of problem:
In WebUI, it is possible (sometimes necessary) to specify a CA certificate for https communication with RHEV. This is done using the "X509 Certification Authorities" field in the new Compute Resource creation form.

In API, this is not possible. Consequently, it is also not possible in Hammer, Nailgun and other tools using API.

Steps to Reproduce:
http://SAT_HOSTNAME/apidoc/v2/compute_resources/create.html

Actual results:
No parameter for CA cert

Expected results:
public_key (id of the WebUI input field) parameter