Memcache\Redis Add DB Select Functionality

config/config.sample.php

@@ -831,7 +831,8 @@ $CONFIG = array(
 'redis' => array(
 	'host' => 'localhost', // can also be a unix domain socket: '/tmp/redis.sock'
 	'port' => 6379,
-	'timeout' => 0.0
+	'timeout' => 0.0,
+	'dbindex' => 0, // Optional, if undefined SELECT will not run and will use Redis Server's default DB Index.
 ),
 
 /**

lib/private/memcache/redis.php

@@ -51,7 +51,12 @@ class Redis extends Cache {
 			} else {
 				$timeout = 0.0; // unlimited
 			}
+
 			self::$cache->connect( $host, $port, $timeout );
+
+			if (isset($config['dbindex'])) {
+				self::$cache->select( $config['dbindex'] );
+			}
 		}
 	}