Adding keepalived support to the pool source.

lib/pool.js

@@ -694,6 +694,13 @@ function handleMinerData(method, params, ip, portData, sendReply, pushMessage) {
 
             sendReply(null, {status: 'OK'});
             break;
+        case 'keepalived':
+            if (!miner) {
+                sendReply('Unauthenticated');
+                return;
+            }
+            sendReply('KEEPALIVED');
+            break;
     }
 }