MXS-1300: Improve test coverage

The tests now cover 100% of all source files with the exception of the
call.js and common.js source files.

maxctrl/test/unknown.js

@@ -6,6 +6,8 @@ describe("Unknown Commands", function() {
     var endpoints = [
         'list',
         'show',
+        'set',
+        'clear',
         'enable',
         'disable',
         'create',
@@ -26,5 +28,10 @@ describe("Unknown Commands", function() {
         })
     })
 
+    it('generic unknown command', function() {
+        return doCommand('something')
+            .should.be.rejected
+    })
+
     after(stopMaxScale)
 });