Commits on Mar 17, 2020

1. feat!: Use / as the default path for new apps …

   Currently, each Load Balanced Web App is created and is asigned
   a path of "/{app name}" on the ALB. This makes sense, but there
   are some gotchas.
   
   First, your app has to be prepared to handle paths of "/{app name}".
   This is probably a little unlikely unless your lucky. Most apps
   expect to be run as if they are receiving requests on the root
   path "/" (see every tutorial ever) 😂
   
   What this change does is it defaults your first app to being hosted
   on "/" but at the last evaluated rule. This is probably a more
   intuitive default (and we've gotten some customer feedback on this).
   
   Subsequent apps still have to use the path based route.
   
   So:
   
   ```sh
   ecs init --app front-end # produces a URL of http://my-lb.us-west-2.amazon.com/
   ecs init --app api       # produces a URL of http://my-lb.us-west-2.amazon.com/api/
   ```
   
   This change adjusts the priority generator so that "/" is evaluated last.
   
   Customers are still free to change the path in their manifest. They can use
   the special "/" path to signify that they want this to be their default route.
   
   __ Why didn't you just use the default action ? __
   
   One kind of odd thing we did here is give the "/" path a really high rule
   priority, rather than just setting it as the default route. There are a few
   reasons we did that.
   
   1. It's a bit messy as the default route action is managed in the environment stack
      and there's really not a great way to update it.
   2. If a customer changes their app to use a named path, rather than the default "/"
      path - it will only require a dpeloyment of the app, rather than then the app
      AND the env (which is a different stack).
   
   This change also has some other E2E bug fixes in it (like setting the healthcheck
   path by default).

   

   kohidave committed Mar 17, 2020
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