Add tests for Role.
Add tests for Role.

test_delete is currently failing.
dipakvwarade/pychef,jarosser06/pychef,dipakvwarade/pychef,coderanger/pychef,jarosser06/pychef,Scalr/pychef,cread/pychef,Scalr/pychef,cread/pychef,coderanger/pychef