Don't use #tap before Active Support is available, since older versions of ruby don't have native implementations

[#2603 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

This commit breaks all exception catching plugins like ExceptionNotifier. These plugins should be rewritten as middleware instead overriding Controller#rescue_action_in_public.

Functional test runner finalizes response just like the integration test runner. In both runners, the @response object will now behave the same.

Some functional tests will need to be updated if they are relying on preprocessed data on the response.

[#2595 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

[#2594 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

[#2346 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Ensure ActiveRecord::Base.connection_pool.with_connection creates a new connection only when needed [#1752 state:resolved]
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Methods raising ActiveRecord::RecordNotFound were returning 404 on first request and 200 OK with blank body on subsequent requests.

[#2533 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>