ConfigData: run UpgradeConfig on network objects

Although this does nothing for now, running it is safe, and consistent
with how other objects behave.

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

lib/objects.py

@@ -499,6 +499,8 @@ class ConfigData(ConfigObject):
         self.cluster.drbd_usermode_helper = constants.DEFAULT_DRBD_HELPER
     if self.networks is None:
       self.networks = {}
+    for network in self.networks.values():
+      network.UpgradeConfig()
 
 
 class NIC(ConfigObject):