Ignore ReinitializeDevice and DeviceCommunicationControl service password (#518)

* Fix device object ReinitializeDevice service handling examples of no-password in the device. Add unit testing of device object ReinitializeDevice service.  Add API for setting ReinitializeDevice device object password.

* Fix DeviceCommunicationControl service handling example of no-password in the device.

---------

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

src/bacnet/basic/service/h_dcc.c

@@ -173,8 +173,8 @@ void handler_device_communication_control(uint8_t *service_request,
         if (len > 0)
             goto DCC_ABORT;
 #endif
-
-        if (characterstring_ansi_same(&password, My_Password)) {
+        if ((My_Password[0] == '\0') ||
+            characterstring_ansi_same(&password, My_Password)) {
             len = encode_simple_ack(&Handler_Transmit_Buffer[pdu_len],
                 service_data->invoke_id,
                 SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL);