[libvirt] Using external ceph.conf for RBD pools and disks

[Michael Chapman]

On Fri, 1 Nov 2013, Eric Blake wrote:
> The old behavior is broken, so we can bill this as a bug fix
> (previously, qemu would behave differently than what the XML defined,
> which is not supposed to happen) rather than a backwards-incompatible
> change.  Can you propose a patch in time for inclusion in 1.1.4?

I can hammer out a patch quickly, but I won't have a chance to run it on a 
Ceph-enabled test machine before Monday. It's not critical, so I suggest 
it goes in after 1.1.4 is released.

- Michael