MXS-1300: Add more MaxCtrl cluster tests

Added scripts that start two MaxScale on the same machine. This allows the
cluster synchronization commands to be tested locally.

maxctrl/test_utils.js

@@ -28,6 +28,19 @@ module.exports = function() {
         })
     };
 
+    // Start two MaxScales
+    this.startDoubleMaxScale = function() {
+        return new Promise(function(resolve, reject) {
+            child_process.execFile("./start_double_maxscale.sh", function(err, stdout, stderr) {
+                if (err) {
+                    reject()
+                } else {
+                    resolve()
+                }
+            })
+        })
+    };
+
     // Stop MaxScale, this should be called in the `after` handler of each test unit
     this.stopMaxScale = function() {
         return new Promise(function(resolve, reject) {
@@ -41,6 +54,19 @@ module.exports = function() {
         })
     };
 
+    // Stop two MaxScales
+    this.stopDoubleMaxScale = function() {
+        return new Promise(function(resolve, reject) {
+            child_process.execFile("./stop_double_maxscale.sh", function(err, stdout, stderr) {
+                if (err) {
+                    reject()
+                } else {
+                    resolve()
+                }
+            })
+        })
+    };
+
     // Execute a single MaxCtrl command, returns a Promise
     this.doCommand = function(command) {
         var ctrl = require('./lib/core.js')