Comment 2 for bug 1161027

Reviewed: https://review.openstack.org/25543
Committed: http://github.com/openstack/nova/commit/8d68ed3583df6ced4b4c8b6d6bb3569e03992cfe
Submitter: Jenkins
Branch: master

commit 8d68ed3583df6ced4b4c8b6d6bb3569e03992cfe
Author: Sean Dague <email address hidden>
Date: Wed Mar 27 13:29:15 2013 -0400

    always quote dhcp-domain, otherwise dnsmasq can fail to start

    the dnsmasq arg --dhcp-domain can't be passed to dnsmasq as empty
    (i.e. --dhcp-domain= ) unlike many other arguments. If you do pass
    it as empty, dnsmasq won't start, throwing a ProcessException which
    then crashes the rest of nova-network.

    Fix this by quoting dhcp-domain so that empty domains are allowed.

    Fixed bug #1161027

    This was found by grenade upgrade testing

    Change-Id: Id24814339d8c8a709f5041f0aa98b10ba1e0e595