Allow remote server to be used for maxctrl test suite

The test suite now works with remote servers and is now fully integrated
to the regression test suite.

maxctrl/test_utils.js

@@ -15,6 +15,13 @@ module.exports = function() {
     this.expect = chai.expect
     this.host = 'http://localhost:8989/v1/'
 
+    this.primary_host = '127.0.0.1:8989'
+    this.secondary_host = '127.0.0.1:8990'
+
+    if (process.env.maxscale2_API) {
+        this.secondary_host = process.env.maxscale2_API
+    }
+
     // Start MaxScale, this should be called in the `before` handler of each test unit
     this.startMaxScale = function() {
         return new Promise(function(resolve, reject) {