Description of problem:

While creating Operating system, it accepts negative values for major version  

How reproducible:

100%

Is this issue a regression from an earlier version:

Steps to Reproduce:

1. Try to create a OS with negative major version value

Actual behavior:
It accepts the negative value for major version

Expected behavior:
It should not accept the negative value for major version and show the error while submitting

Business Impact / Additional info:

QE Tracker for https://issues.redhat.com/browse/SAT-29214