Robottelo server.yaml allow hostname lists based on satellite versions

[jyejare]

Currently, there is no way we provide a satellite hostnames list in server.yaml based on satellite (x.y) versions. Due to this if we switch the robottelo environment the tests end up on the same list of satellite versions.

We need some mechanism to autoPick the satellites from the list based on sat version.

[JacobCallahan]

That field could be expanded to either be a list or a dictionary of lists, then align_to_xdist could attempt to determine the server version and select the correct list from there.

[jyejare]

@JacobCallahan Right !