define all server intervals in a map so we can easily clear them all

lib/commands/admin-rpc.js

@@ -15,11 +15,20 @@ var getActiveSessions = function (Env, Server, cb) {
 };
 
 var shutdown = function (Env, Server, cb) {
-    return void cb('E_NOT_IMPLEMENTED');
-    //clearInterval(Env.sessionExpirationInterval);
-    // XXX set a flag to prevent incoming database writes
-    // XXX disconnect all users and reject new connections
-    // XXX wait until all pending writes are complete
+    if (true) {
+        return void cb('E_NOT_IMPLEMENTED');
+    }
+
+    // disconnect all users and reject new connections
+    Server.shutdown();
+
+    // stop all intervals that may be running
+    Object.keys(Env.intervals).forEach(function (name) {
+        clearInterval(Env.intervals[name]);
+    });
+
+    // set a flag to prevent incoming database writes
+    // wait until all pending writes are complete
     // then process.exit(0);
     // and allow system functionality to restart the server
 };