HPCC-11696 Suppress false update of new 'spares' clusters

Signed-off-by: Jake Smith <jake.smith@lexisnexisrisk.com>

dali/base/dadfs.cpp

@@ -9466,7 +9466,7 @@ class CInitGroups
                 }
             }
         }
-        if (!existingClusterGroup || (!matchExisting && !matchOldEnv))
+        if ((!existingClusterGroup && (grp_thorspares != groupType)) || (!matchExisting && !matchOldEnv))
         {
             VStringBuffer msg("New cluster layout for cluster %s", gname.str());
             WARNLOG("%s", msg.str());