Merge changes I3250bdb9,I20f6e5e1,I70c96a09,I88f77bd4,If6cefa51, ...

* changes:
  ethernet: rename methods in EthernetNetworkFactory
  ethernet: move registerNetworkOffer into its own function
  ethernet: provider to keep track of requestId
  ethernet: return result when removing interface
  ethernet: enable testCallbacks_forServerModeInterfaces on CF
  ethernet: expand server mode callbacks test
  ethernet: add test for removing interface while in server mode