Avoid race condition with 1 second sleep.

Upstart will return from 'start xxx' immediately upon forking. We still
need to run start-stop-daemon, change users, exec again, and then run
the python code to get to listen() before the service is actually ready.
This all should take < 1s, but the sleep is just a stopgap until we have
a better way to track "is the service ready" in upstart.

Fixes bug #1179766

Change-Id: I3842e572c940e833cb3036b67df0ee71fe5bb129

elements/os-svc-install/bin/os-svc-daemon

@@ -20,6 +20,9 @@ end script
 respawn
 
 exec start-stop-daemon --start -c $user --exec /opt/stack/venvs/$user/bin/$cmd -- $args
+
+# Help avoid race with daemon listening. http://pad.lv/1179766
+post-start exec sleep 1
 EOF
 }