Add ssh pipelining config for ansible

Now that we're running more than just "puppet apply", reconnecting
starts to add up. Turn on pipelining.

Change-Id: If629485a0e602f1a906fef0cabd73154243d7e3d

playbooks/roles/install-ansible/files/ansible.cfg

@@ -13,3 +13,6 @@ enable_plugins=openstack,constructed,yaml,advanced_host_list,ini
 cache=True
 cache_plugin=jsonfile
 cache_connection=/var/cache/ansible
+
+[ssh_connection]
+pipelining = True