Work around neutron floatingip race condition

Neutron has a problem where neutron-server will only return externally
visible networks after the service has started sometimes. In order to
deal with that we are ssh'ing into the controller node and restarting
neutron-server before trying to create a floatingip. We try for two
minutes before giving up.

Change-Id: Ia4e476339a3d73a8c13ca898e0f0b582adc53828
Related-Bug: #1254555

scripts/devtest_overcloud.sh

@@ -184,12 +184,32 @@ user-config
 
 nova boot --key-name default --flavor m1.tiny --image user demo
 
-## #. Add an external IP for it.
+## #. Add an external IP for it. If this process times out or produces an
+##    error, you may need to restart neutron-server on the controller and try
+##    it again. This is due to https://bugs.launchpad.net/neutron/+bug/1254555
 ##    ::
 
 wait_for 10 5 neutron port-list -f csv -c id --quote none \| grep id
 PORT=$(neutron port-list -f csv -c id --quote none | tail -n1)
-neutron floatingip-create ext-net --port-id "${PORT//[[:space:]]/}"
+##         neutron floatingip-create ext-net --port-id "${PORT//[[:space:]]/}"
+### --end
+# Ugly hack kept out of docs intentionally.
+# Workaround neutron bug https://bugs.launchpad.net/tripleo/+bug/1254555
+ext_net=
+for try in {1..12} ; do
+    ssh -l heat-admin -o StrictHostKeyChecking=no -t $OVERCLOUD_IP sudo service neutron-server restart
+    # Give things time to synchronize.. I think.
+    sleep 10
+    if neutron floatingip-create ext-net --port-id "${PORT//[[:space:]]/}" ; then
+        ext_net=1
+        break
+    fi
+done
+if [ -z "$ext_net" ] ; then
+  echo Still cannot find ext-net after $try tries.
+  exit 42
+fi
+### --include
 
 ## #. And allow network access to it.
 ##    ::