Description of problem:
Currently the validator validate if entities exists in setup, such as clusters, affinity groups and affinity labels, it also check for empty target mappings and other missing attributes.
We should fill the missing gaps for roles, domains and lun disks as well.
Also additional validations should be added.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
This bug has not been marked as blocker for oVirt 4.3.0.
Since we are releasing it tomorrow, January 29th, this bug has been re-targeted to 4.3.1.