update readme to indicate how to start the jobs worker
Merge pull request #3657 from mccun934/add-jobs-readme

update readme to indicate how to start the jobs worker
change katello_api to non-scl for hammer_cli_katello
Merge pull request #3661 from jmontleon/katello_api-nonscl

change katello_api to non-scl for hammer_cli_katello