MXS-1300: Add basic maxctrl tests

Added basic tests for maxctrl. They simply test that the diagnostic
commands work.

maxctrl/test_utils.js

@@ -0,0 +1,26 @@
+var child_process = require("child_process")
+
+module.exports = function() {
+    this.request = require("request-promise-native")
+    this.chai = require("chai")
+    this.assert = require("assert")
+    this.chaiAsPromised = require("chai-as-promised")
+    chai.use(chaiAsPromised)
+    this.should = chai.should()
+    this.expect = chai.expect
+
+    this.startMaxScale = function(done) {
+        child_process.execFile("./start_maxscale.sh", function(err, stdout, stderr) {
+            if (process.env.MAXSCALE_DIR == null) {
+                throw new Error("MAXSCALE_DIR is not set");
+            }
+
+            done()
+        })
+    };
+    this.stopMaxScale = function(done) {
+        child_process.execFile("./stop_maxscale.sh", function(err, stdout, stderr) {
+            done()
+        })
+    };
+}