qemuMonitorTestProcessCommandDefaultValidate: Output validator output to stderr
qemuMonitorTestProcessCommandDefaultValidate: Output validator output to stderr

Trying to squeeze the validator output into the monitor reply message
doesn't make sense and doesn't work well as it's not well formed JSON:

54) qemuMonitorJSONAddNetdev                                          ... libvirt:  error : internal error: cannot parse json { "error":  { "desc": "failed to validate arguments of 'netdev_add' against QAPI schema: {
   ERROR: variant 'test' for discriminator 'type' not found
",    "class": "UnexpectedCommand" } }: lexical error: invalid character inside string.
          ev_add' against QAPI schema: {    ERROR: variant 'test' for
                     (right here) ------^
FAILED

Output it to stderr if requested and just note that schema validation
failed in the error message:

54) qemuMonitorJSONAddNetdev                                          ...
failed to validate arguments of 'netdev_add' against QAPI schema
args:
{
  "id": "net0",
  "type": "test"
}

validator output:
 {
   ERROR: variant 'test' for discriminator 'type' not found

libvirt: QEMU Driver error : internal error: unable to execute QEMU command 'netdev_add': failed to validate arguments of 'netdev_add' against QAPI schema (to see debug output use VIR_TEST_DEBUG=2)
FAILED

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

nertpinx/libvirt,libvirt/libvirt,zippy2/libvirt,jardasgit/libvirt,crobinso/libvirt,libvirt/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,olafhering/libvirt,olafhering/libvirt,olafhering/libvirt,jardasgit/libvirt,jfehlig/libvirt,olafhering/libvirt,jardasgit/libvirt,crobinso/libvirt,zippy2/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,zippy2/libvirt,libvirt/libvirt,zippy2/libvirt,fabianfreyer/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,crobinso/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,jardasgit/libvirt,fabianfreyer/libvirt