New actions to add to satellite-populate

[chbrown13]

Additional actions are required to automate the following scenario in Satellite 6 with satellite-populate from @sthirugn:

enable rhel7server repo, enable satellite tools for rhel7 server, sync repos, create rhel7 content view, add these two repos, publish content view, create an activation key, add subscriptions, enable these synced repos

To accomplish this, actions for sync, enable, and publish need to be created as well as possibly adding a Manifest or Manifest entity.

[chbrown13]

Possibly something like this?