Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1120985
Description of problem:
I was trying to create OS with name RedHat and version 6.5. Later, I realized OS was already there with same name and version. I think UI should throw some error message that "OS Name with same version has already been taken"

I think we can't uniqueify OS just on the basis of name. As OS can be of same name but with diff versions.

Version-Release number of selected component (if applicable):
sat6 GA snap1

How reproducible:
always

Steps to Reproduce:
1. create a OS with name RedHat and major/minor version: 6/5
2. create another OS with same name and version.
3.

Actual results:
UI allows use to create OS with same name and version

Expected results:
UI should throw error if one OS already there with same name and version

Additional info: