Chown glance-image-sync.log to glance:glance and lock to /var/lib/glance

Current installations run glance-image-sync as root, so we chown that file to
ensure we can run and log as glance user.  Also removing
/var/lock/glance-image-sync as we will create that directory in our OS package,
so for now we just lock to /var/lib/glance which already exists and is
writable by glance user.