Removing Shell::_loadDbConfig() and Shell::$DbConfig

They did not make sense in Shell as no other core shells even use these
properties/methods.

cake/console/libs/shell.php

@@ -45,15 +45,6 @@ class Shell extends Object {
  */
 	public $interactive = true;
 
-/**
- * Holds the DATABASE_CONFIG object for the app. Null if database.php could not be found,
- * or the app does not exist.
- *
- * @var DATABASE_CONFIG
- * @access public
- */
-	public $DbConfig = null;
-
 /**
  * Contains command switches parsed from the command line.
  *
@@ -236,22 +227,6 @@ protected function _welcome() {
 		$this->hr();
 	}
 
-/**
- * Loads database file and constructs DATABASE_CONFIG class
- * makes $this->DbConfig available to subclasses
- *
- * @return bool
- */
-	protected function _loadDbConfig() {
-		if (config('database') && class_exists('DATABASE_CONFIG')) {
-			$this->DbConfig =& new DATABASE_CONFIG();
-			return true;
-		}
-		$this->err('Database config could not be loaded.');
-		$this->out('Run `bake` to create the database configuration.');
-		return false;
-	}
-
 /**
  * if public $uses = true
  * Loads AppModel file and constructs AppModel class