[libvirt] [PATCH] Unify *ReportError logic

[Cole Robinson]

Currently, most src/* files have their own ReportError
function. Some support printf style arguments, others
only allow reporting a single string message. The code
for all of them does virtually the same thing, possibly
passing a different constant off to another function.

The attached patch adds a function to virterror.c which
encapsulates the common ReportError logic. I used this
to replace qemudReportError with a macro, which also 
allows passing off filename and line number info if
we wanted to do something with it later.

I did just the one function conversion to see what
people think: if I'm missing something, or ideas for
anything else to add. Seems to work as expected in
my testing.

Thanks,
Cole
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