[Libvir] Patch: driver->open functions return declined or error status

I want to change the driver->open function so that as well as declining a name (returning -1 as now), it may also indicate that it accepts the name, but there is an error opening the name (-2). virConnectOpen fails in this second case, rather than going on and trying the next driver in sequence. Rich. -- Emerging Technologies, Red Hat http://et.redhat.com/~rjones/ 64 Baker Street, London, W1U 7DF Mobile: +44 7866 314 421 "[Negative numbers] darken the very whole doctrines of the equations and make dark of the things which are in their nature excessively obvious and simple" (Francis Maseres FRS, mathematician, 1759)