Improve documentation for AWX E2E (#1381)

* Improve documentation for AWX E2E

awx/ui/test/e2e/README.md

@@ -1,31 +1,45 @@
 ## AWX E2E
-```shell
+#### Introduction
-# setup
+This is an automated functional test suite for the front end.
-docker exec -i tools_awx_1 sh <<-EOSH
-  awx-manage createsuperuser --noinput --username=awx-e2e --email=null@ansible.com
-  awx-manage update_password --username=awx-e2e --password=password
-EOSH
 
+#### Technology
+The tests are written in Node.js and use the [Nightwatch](https://github.com/nightwatchjs/nightwatch) test runner.
+
+#### Requirements
+- node.js 6.x LTS
+- npm 3.x LTS
+
+#### Installation
+A successful invocation of `make ui-devel` will prepare your environment with the software
+dependencies required to run these tests.
+
+#### Configuration
+Three inputs are required:
+
+*AWX_E2E_URL*
+
+> A valid url for a running AWX instance that is reachable by your machine. This can be your local
+development instance or other awx instance. Defaults to *https://localhost:8043*.
+
+*AWX_E2E_USERNAME*
+
+> A valid admin username for the target awx instance. Defaults to *awx-e2e*.
+
+*AWX_E2E_PASSWORD*
+
+> A valid password for the admin. Defaults to *password*.
+
+These inputs can be provided as environment variables or defined as default values in [settings](settings.js).
+The settings file also contains all other configurable input values to this test suite.
+
+#### Usage
+```shell
 # run all of the tests with a live browser
 npm --prefix awx/ui run e2e
 
 # run a subset of the tests
 npm --prefix awx/ui run e2e -- --filter="test-credentials*"
-
-# setup a local webdriver cluster for test development
-docker-compose \
-  -f awx/ui/test/e2e/cluster/docker-compose.yml \
-  -f awx/ui/test/e2e/cluster/docker-compose.devel-override.yml \
-  up --scale chrome=2 hub chrome
-
-# run headlessly on the cluster
-AWX_E2E_LAUNCH_URL='https://awx:8043' npm --prefix awx/ui run e2e -- --env=cluster
-
-# run with multiple workers
-AWX_E2E_LAUNCH_URL='https://awx:8043' AWX_E2E_CLUSTER_WORKERS=2 \
-  npm --prefix awx/ui run e2e -- --env=cluster --filter="test-*"
 ```
-
 **Note:**
-- Unless overridden in [settings](settings.js), tests will run against `localhost:8043`.
 - Use `npm --prefix awx/ui run e2e -- --help` to see additional usage information for the test runner.
+- All example commands in this document assume that you are working from the root directory of the awx project.