zuul dependencies update

This add some Ubuntu packages as Zuul dependencies, although they are
listed in tools/pip-requires already. New dependencies are:

 - python-lockfile
 - python-paramiko
 - python-yaml

I am not sure how well the Ubuntu versions will work out versus the one
from pip.

Change-Id: Ie56da494db7eb4925834824028ed6471b91be77b
Reviewed-on: https://review.openstack.org/13575
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Paul Belanger <paul.belanger@polybeacon.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins

modules/zuul/manifests/init.pp

@@ -9,7 +9,10 @@ class zuul (
 ) {
   $packages = ["python-webob",
                "python-daemon",
-               "python-paste"]
+               "python-lockfile",
+               "python-paramiko",
+               "python-paste",
+               "python-yaml"]
 
   package { $packages:
     ensure => "present",