[Libvir] [PATCH] Don't throw away errors in virConnectOpen (at least not so often)

[Richard W.M. Jones]

Error messages, I like them.  I don't like them to be thrown away.

A nice feature of virterror is that it'll throw away errors under the 
following conditions:
(1) You are in virConnectOpen, and
(2) You pass a non-NULL virConnectPtr to __virRaiseError.

libvirt has a lot of errors which meet those conditions - the attached 
patch fixes the ones I could find.

It also fixes qemuOpenConnection so that it doesn't try to open a Unix 
socket with random stack data.

It also adds error messages in some useful places where previously there 
was an error, but no message.

Rich.

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