The _resource_extend module is already rehomed into neutron-lib and is shimmed in neutron. This patch removes the module as no active consumers are using it. NeutronLibImpact Change-Id: I1550075fa5fa2aa2f1a88ee7189d311a1fe78391
Since it doesn't contain any models anymore, renamed it into subnet_service_type_mixin. Change-Id: I8146c39b8c9bb6c3fde318316122fa215fce2935