Adds devserver support

* Adds support for webpack devserver
* Enable istanbul on network UI
* Enable capture and replay tests on the network ui
* Normalize mouse wheel events
* Fix missing trailing slash on hosts API
* Add Export YAML button

awx/ui/build/webpack.watch.js

@@ -51,6 +51,7 @@ const watch = {
         stats: 'minimal',
         publicPath: '/static/',
         host: '127.0.0.1',
+        https: true,
         port: 3000,
         https: true,
         proxy: {
@@ -64,6 +65,11 @@ const watch = {
                 target: TARGET,
                 secure: false,
                 ws: true
+            },
+            '/network_ui': {
+                target: TARGET,
+                secure: false,
+                ws: true
             }
         }
     }