Match Dev/Prod parity for Index Page

With Rails 4 the default index page was moved from a static file `index.html` inside the `public/` folder to an internal controller/view inside of the railties gem. This was to allow use of erb in the default index page and to remove the requirement that new apps must delete a static file to make their index pages work. While this was a good change, the functionality was unexpected to developers who wish to get their apps running in production ASAP. They will create a new app `rails new my app`, start a server to verify it works, then immediately deploy the app to verify that it can start working in production. Unfortunately locally they see a page when they visit `localhost:3000` when they visit their production app they get an error page.

We initially anticipated this problem in the original pull request, but did not properly anticipate the severity or quantity of people who would like this functionality. Having a default index page serves as an excellent litmus test for a passed deploy on default apps, and it is very unexpected to have a page work locally, but not on production. 

This change makes the default index page available in production if the developer has not over-written it by defining their own `root` path inside of routes.
metal is no longer mentioned on rack guide
rescue from all exceptions in `ConnectionManagement#call`

Fixes #11497

As `ActiveRecord::ConnectionAdapters::ConnectionManagement` middleware does not rescue from Exception (but only from StandardError),
the Connection Pool quickly runs out of connections when multiple erroneous Requests come in right after each other.

Recueing from all exceptions and not just StandardError, fixes this behaviour.
Merge pull request #11514 from schneems/schneems/dev-prod-parity-index

Match Dev/Prod parity for Index Page
Merge pull request #11538 from vipulnsward/rescue-exp

rescue from all exceptions in `ConnectionManagement#call`
Merge pull request #11536 from dpickett/patch-1

metal is no longer mentioned on rack guide
syntax fix for f.select doc.  [ci skip] .
removed unnecessary hash brackets for f.select