Optimized upstream & loadbalancer

- Test and optimized load balancer origin picker
- Fixed no active origin cannot load proxy rule bug
- Implemented logger design in websocket proxy module
- Added more quickstart tours
- Fixed #270 (I guess)
- Fixed #90 (I guess)

src/web/script/quicksetup.js

@@ -496,6 +496,7 @@ var tourSteps = {
                 <br><br>Now, you can try to visit your website with https:// and see your green lock shows up next to your domain name!`,
             element: "#cert div[tourstep='certTable']",
             scrollto: "#cert div[tourstep='certTable']",
+            tab: "cert",
             pos: "bottomright",
             callback: function(){
                 hideSideWrapperInTourMode();