When an oVirt CR is created, it saves public key of CA that issues the certificate for oVirt in attrs[:public_key]. In 1.7.0 there was added a new text-area so user can set the CA cert manually in the form. There's also public_key hidden field that was used before to keep public_key on updates if there was already some data center loaded. Since it's after the text area, it always overrides its value which is a problem when editing the CR.

Steps to reproduce:
1. create oVirt CR, make sure it has public key stored
2. change the CA/self-signed certificate on oVirt instance
3. edit the CR in Foreman, delete old public key in text area and try hitting load datacenters/test connection button

Result:
you'll see that the request fails on SSL issue, if you check the text area, you can see that the public key is reset to the old value

Expected:
it should load new public key and sucessfuly load data centers