Add RHCloud.advisor_engine_config API

[tpapaioa]

Description of changes

Add advisor_engine_config method to the RHCloud entity, to call and return the response from the new API method introduced in theforeman/foreman_rh_cloud#932

Upstream API documentation, plugin, or feature links

theforeman/foreman_rh_cloud#932

Needed for robottelo tests:

SAT-30174
SatelliteQE/robottelo#17342

Functional demonstration

Example:

>>> from robottelo.hosts import Satellite
>>> sat = Satellite(hostname='XXX')
>>> sat.api.RHCloud().advisor_engine_config()
{'use_local_advisor_engine': False}

Additional Information

[ColeHiggins2]

Looks good to me