We've deprecated qemuConnectDomainXMLFromNative qemuDomainQemuAttach.
Switch the error code from VIR_ERR_OPERATION_UNSUPPORTED to the new
VIR_ERR_DEPRECATED.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>