after_fork and redis

[bradford <fingermark@gmail.com>]

I'm using unicorn w/ a rails app.  I have the following in my
environment.rb $redis = MyApplication::Application.config.redis and in
production.rb I have config.redis = Redis.new(host: "localhost").

I've read I'm supposed to $redis = Redis.new(host: "localhost") in
after_fork when preload_app is true.

When I don't do this, each worker/pid seems to have their own redis
instance.  So, why is this needed?  Here's the logs of me printing out
$redis.client.inspect when both $redis = Redis.new in the after_fork
and just $redis = Redis.new in the environment.rb.

No after fork
https://gist.github.com/bc2c2a3bda01c35730e2

After fork
https://gist.github.com/0c96550660d3926ffe16

The only thing different I notice is Connection::TCPSocket:fd is
always 13 w/ the after fork.
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