[Libvir] [QEMU 1/3] hook up driver methods for inactive domains

[Daniel P. Berrange]

The attached patch prepares the driver method API to support inactive
domains. The following methods are hooked up:

 * virConnectListDefinedDomains
 * virConnectNumOfDefinedDomains
 * virDomainDefineXML
 * virDomainUndefine
 * virDomainCreate

It sets all existing drivers to have NULL in these fields.

The existing code in virDomainDefineXML was ripped out since it was found
to be more trouble than it was worth - the backend driver needed to repeat
most of the logic anyway - so better just to delegate the whole lot.

Regards,
Dan.
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