MXS-1220: Add request option test

Currently only the `pretty=true` option is supported but it is also
tested.

server/core/test/rest-api/test/options.js

@@ -0,0 +1,12 @@
+require("../utils.js")()
+
+describe("Request Options", function() {
+    before(startMaxScale)
+
+    it("pretty=true", function() {
+        return request.get(base_url + "/services/?pretty=true")
+            .should.eventually.satisfy(validate)
+    })
+
+    after(stopMaxScale)
+});