The NetworkManager logic was implemented directly into the `HaClusterTopology`, which wasn't directly its concern and prevented us from being able to reuse that NetworkManaager implementations in the future for a different Topology.
* Extract a `NetworkManager` trait
* Implement a `OpenShiftNmStateNetworkManager` for `NetworkManager`
* Dynamically instantiate the NetworkManager in the Topology to delegate calls to it
Reviewed-on: #183
Reviewed-by: johnride <jg@nationtech.io>
Ian Letourneau
06a004a65d