log messages typos in rebuild_instance function

[Chen Xiao]

one simple log typos in compute/manager.py rebuild_instance function.
             else:
                    image_ref = orig_image_ref = instance.image_ref
                    LOG.info(_("disk not on shared storagerebuilding from:"
                               " '%s'") % str(image_ref))

should change to
                    LOG.info(_("disk not on shared storage, rebuilding from:"
                               " '%s'") % str(image_ref))

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/78573

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/78573
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1284c4d2e471809635a070289ace0049abf38f18
Submitter: Jenkins
Branch: master

commit 1284c4d2e471809635a070289ace0049abf38f18
Author: Xiao Chen <email address hidden>
Date: Thu Mar 6 18:35:33 2014 +0800

    Fix log messages typos in rebuild_instance function

    One log message typos in rebuild_instance function.

    Change-Id: I0c86a40b6683f3a8a091134b6f37c82a4562370e
    Closes-Bug: #1288661