Backport PR #8209

---------

**Commit 1:**
[optimizer] move to querystring-browser package for up-to-date api

Webpack automatically injects libraries to support many node.js APIs in the browser using the https://github.com/webpack/node-libs-browser package. This package uses https://github.com/mike-spainhower/querystring for the querystring module, but that module hasn't been updated in 4 years and doesn't support the modern querystring api.

This change points to the https://github.com/mathiasvr/querystring package instead, which is up to date (specifically it supports the `encodeURIComponent` option of [`querystring.stringify`](https://nodejs.org/api/querystring.html#querystring_querystring_stringify_obj_sep_eq_options).

* Original sha: 1030689f4a
* Authored by spalger <spalger@users.noreply.github.com> on 2016-09-09T21:10:50Z

package.json

@@ -91,6 +91,7 @@
     "babel-loader": "5.3.2",
     "babel-runtime": "5.8.38",
     "bluebird": "2.9.34",
+    "body-parser": "1.12.0",
     "boom": "2.8.0",
     "brace": "0.5.1",
     "bunyan": "1.7.1",
@@ -109,6 +110,7 @@
     "extract-text-webpack-plugin": "0.8.2",
     "file-loader": "0.8.4",
     "font-awesome": "4.4.0",
+    "glob": "5.0.13",
     "glob-all": "3.0.1",
     "good-squeeze": "2.1.0",
     "gridster": "0.5.6",
@@ -133,8 +135,11 @@
     "mkdirp": "0.5.1",
     "moment": "2.13.0",
     "moment-timezone": "0.5.4",
+    "node-fetch": "1.3.2",
     "node-uuid": "1.4.7",
     "papaparse": "4.1.2",
+    "pegjs": "0.9.0",
+    "querystring-browser": "1.0.4",
     "raw-loader": "0.5.1",
     "request": "2.61.0",
     "rimraf": "2.4.3",
@@ -144,6 +149,7 @@
     "semver": "5.1.0",
     "style-loader": "0.12.3",
     "tar": "2.2.0",
+    "tinygradient": "0.3.0",
     "trunc-html": "1.0.2",
     "trunc-text": "1.0.2",
     "url-loader": "0.5.6",
@@ -151,12 +157,7 @@
     "webpack": "1.12.15",
     "webpack-directory-name-as-main": "1.0.0",
     "whatwg-fetch": "0.9.0",
-    "wreck": "6.2.0",
-    "body-parser": "1.12.0",
-    "glob": "5.0.13",
-    "node-fetch": "1.3.2",
-    "pegjs": "0.9.0",
-    "tinygradient": "0.3.0"
+    "wreck": "6.2.0"
   },
   "devDependencies": {
     "@elastic/eslint-config-kibana": "0.0.3",

src/ui/ui_bundler_env.js

@@ -46,7 +46,8 @@ module.exports = class UiBundlerEnv {
     // webpack aliases, like require paths, mapping a prefix to a directory
     this.aliases = {
       ui: fromRoot('src/ui/public'),
-      test_harness: fromRoot('src/test_harness/public')
+      test_harness: fromRoot('src/test_harness/public'),
+      querystring: 'querystring-browser',
     };
 
     // map of which plugins created which aliases