Feature/mstp zero config option (#564)

* Added a MS/TP zero-config (automatically choose an unused MAC address) using an algorithm that starts with MAC=64 and waits for a random number of PFM (minimum of 8 plus modulo 64) before attempting to choose a MAC sequentially from 64..127. The confirmation uses a 128-bit UUID with the MSTP Test Request frame. The modifications are in src/bacnet/datalink/mstp.c and src/bacnet/datalink/dlmstp.c modules enabling any device to use zero-config if enabled. A working demonstration is in the ports/stm32f4xx for the NUCLEO board. Complete unit testing is included.  Options include lurking forever (wait for a router or another master node before joining) or lurking for a minimum time (enables self forming automatic MAC addressing device nodes).

src/bacnet/basic/object/netport.c

@@ -2631,6 +2631,7 @@ bool Network_Port_Read_Range(
             (void)pInfo;
             pRequest->error_class = ERROR_CLASS_PROPERTY;
             pRequest->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
+            (void)pInfo;
 #endif
             break;
         case PROP_BBMD_FOREIGN_DEVICE_TABLE:
@@ -2642,6 +2643,7 @@ bool Network_Port_Read_Range(
             (void)pInfo;
             pRequest->error_class = ERROR_CLASS_PROPERTY;
             pRequest->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
+            (void)pInfo;
 #endif
             break;
         default: