Fix value ValueError when Pod has no IP address

In case the Pod has no IP address we shouldn't attempt to
convert it to a Python address. Instead, we should skip that
operation and expect it to be retried later.

Change-Id: I1eb9c2f51fd792405cbb87742645518a00fdc890

kuryr_kubernetes/controller/drivers/network_policy.py

@@ -637,6 +637,8 @@ class NetworkPolicyDriver(base.NetworkPolicyDriver):
     def _pods_in_ip_block(self, pods, resource):
         for pod in pods:
             pod_ip = driver_utils.get_pod_ip(pod)
+            if pod_ip is None:
+                continue
             if (ipaddress.ip_address(pod_ip)
                     in ipaddress.ip_network(resource.get('cidr'))):
                 return True