Add config for specifying Redis database

[bryannielsen]

When creating a Redis connection it should be possible to choose a database through the configuration settings.

Currently you can specify connection details in config.php

$config['redis'] = array(
  'host' => '127.0.0.1',
  'password' => NULL,
  'port' => 6379,
  'timeout' => 0
);

It would be helpful if you could also specify a database to use:

$config['redis'] = array(
  'host' => '127.0.0.1',
  'password' => NULL,
  'port' => 6379,
  'timeout' => 0,
  'database' => 2
);

The original post for this request can be found on the ExpressionEngine Forum

[intoeetive]

I think this might need implementation similar to #3716