Add a contenthost_factory to perform post-deploy actions

[JacobCallahan]

The intent of this change is to enable us to add post-deploy actions when requesting specific types of content hosts, like fips-enabled. Users can define a set of host_post_configs in conf/content_host.yaml file. They can then add the post config action under the host definition.

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[jyejare]

@JacobCallahan I think the approach shown in https://github.com/SatelliteQE/robottelo/pull/16903/files is much more straightforward and has fewer changes needed to make this change today and in future as well.

Though I agree that the post deploy configs are not visible within the module and happen behind the scenes but its not impossible to find those. Hense I sold on the idea of #16903 (comment) , else I too had a similar structure defined before changing my mind.

CC: @ogajduse