[Libvir] [PATCH] Tidy up the error messages produced by test driver

[Richard W.M. Jones]

This minor patch:

* Introduces a VIR_FROM_TEST class of errors and makes errors generated 
by test come from that class.

* Provides a reasonable error message if the user forgets to supply a 
path.  Also stops the driver from trying to open ("/").  Example:
      $ src/virsh -c test:/// capabilities
      libvir: Test error : invalid argument in testOpen: supply a
      path or use test:///default
      lt-virsh: error: failed to connect to the hypervisor

* Arranges that Xen-unified appears last in the list of drivers, because 
qemu and test have well-defined URI syntaxes so can be checked first.

'make check' passes all tests with this patch.

Rich.

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