Properly fail precheck for internal VIP's network

When kolla_internal_vip_address didn't belong to the same network as
network_interface, the prechecks would spit out an ugly error:

  Unexpected templating type error occurred on [snip]:
  argument of type 'NoneType' is not iterable"

This commit fixes the check to execute properly.

Change-Id: I24a066c212c78e105a923525b131724736ac74b6

ansible/roles/prechecks/tasks/port_checks.yml

@@ -461,4 +461,4 @@
   register: ip_addr_output
   changed_when: false
   failed_when: "'169.254.' not in kolla_internal_vip_address and \
-                'False' in kolla_internal_vip_address | ipaddr(ip_addr_output.stdout.split()[3])"
+                kolla_internal_vip_address | ipaddr(ip_addr_output.stdout.split()[3]) is none"