1. Added robottelo tests for run_only_on decorator
2. Optimized the code with the fixes after review comments
Merge pull request #1385 from sthirugn/decoratortest

Added robottelo tests for run_only_on decorator
Make this work on RHEL6
Merge pull request #1388 from jhutar/master

Make this work on RHEL6
Added try/except around cli utils in test_contentview because make_content_view throws CLIFactoryError on error, so it is not necessary to use info to verify if content view was really created, because in that case exception would already have been thrown.
Merge pull request #1350 from AdamSaleh/contentview_rh

Added try/except around cli utils in test_contentview