Description of problem:
=======================
I tried to add additional compute node to an all-in-one installation via packstack.
packstack got stuck with some kind of quantum related issue.
apparently, it happened because of the white-space between IP Addresses:
CONFIG_NOVA_COMPUTE_HOSTS=<IP Address A>, <IP Address B>

Version-Release number of selected component (if applicable):
=============================================================
openstack-packstack-2013.1.1-0.7.dev580.el6ost.noarch

How reproducible:
=================
2/2

Steps to Reproduce:
===================
1. install openstack all-in-one via packstack
2. add additional compute node using packstack answers file as described in Description of problem

Actual results:
===============
packstack gets stuck with the following DEBUG in it's log:

2013-06-04 17:34:41::DEBUG::shell::61::root:: # ============ ssh : None ==========
2013-06-04 17:34:41::DEBUG::shell::75::root:: scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null root@<HOST>:/var/tmp/packstack/f705b0edf2f941d797a8960cd5738462/manifests/ <HOST>_quantum.pp.finished /var/tmp/packstack/20130604-160230-vOvCcq/manifests/ <HOST>_quantum.pp.log
2013-06-04 17:34:41::DEBUG::shell::78::root:: ============ STDOUT ==========

Expected results:
=================
Should be installed with no issues.