Show correct node information for external node

On EclWatch, external node is not shown correctly now on
the node list of thor cluster. This fix shows the node name
to be 'external' and the platform to be 'Unknown'.

Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>

esp/smc/SMCLib/TpWrapper.cpp

@@ -1616,6 +1616,11 @@ void CTpWrapper::getMachineList(const char* clusterName,
                     machineInfo.setDomain(pDomain->getName(sName).str());
                 }
             }
+            else
+            {
+                machineInfo.setName("external");
+                machineInfo.setOS(MachineOsUnknown);
+            }
 
             MachineList.append(machineInfo);
         }