1) Fail if we couldn't figure out what version of Satellite is running.
Otherwise we end up including a playbook that doesn't exist and the
error is misleading.
2) Change the Satellite 6 version check, to use /pulp/api/v2/status
instead of /katello/api/ping; which seems to work better when a
Capsule is used. This URL should work for both Satellite 6 and
3) Document that rhsm_rhsm_port needs to be changed to 8443 if a capsule