fixes #3377 - add altlinux support

Ticket http://projects.theforeman.org/issues/3377

Add altlinux os support. 
As you put 'Altlinux' [there](https://github.com/theforeman/foreman/pull/966/files#diff-d4ad9c79d567051cceead5ad8129c048R22) , it should be the same here. Note only the first letter is upper case. 

It's the only test failing, sorry for going back and forth on this. Mention me in a comment so I notice via email that you updated this so I can take a look at it quickly.
http://ci.theforeman.org/job/test_develop_pr_core/1599/database=mysql,puppet=3.0,ruby=1.9.3/testReport/junit/(root)/OperatingsystemTest__families/test_0008_families_as_collection_contains_correct_names_and_values/