ensure manually modifying hosts adhears to license

* Super user or not, don't allow adding NOR editing (changing the name
of) a host to exceed the host license count.

awx/api/views.py

@@ -1684,8 +1684,10 @@ class HostList(ListCreateAPIView):
 
 class HostDetail(RetrieveUpdateDestroyAPIView):
 
+    always_allow_superuser = False
     model = Host
     serializer_class = HostSerializer
+    permission_classes = (HostPermission,)
 
 
 class InventoryHostsList(SubListCreateAttachDetachAPIView):