Support settimeout in QEMUMonitorProtocol

This method is used in the following qemu-ga-client script
to implement non-blocking operations.
Signed-off-by: NRyota Ozaki <ozaki.ryota@gmail.com>
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>

QMP/qmp.py

@@ -162,3 +162,8 @@ class QEMUMonitorProtocol:
     def close(self):
         self.__sock.close()
         self.__sockfile.close()
+
+    timeout = socket.timeout
+
+    def settimeout(self, timeout):
+        self.__sock.settimeout(timeout)