First pass at allowing jenkins.py to only run cloud tests

`cloud_config_sls='could-test-configs'` instead of `cloud_prep_sls='cloud-test-configs'` or change `'salt -t 600 {target} state.sls {cloud_config_sls} pillar="{pillar}"` to `'salt -t 600 {target} state.sls {cloud_prep_sls} pillar="{pillar}"`