EZP-21914: Added set/getDbHandler to Legacy\EzcDbHandler

Allows us to reset the db link when required, for instance
when forking.
(cherry picked from commit 13d9cd2)

eZ/Publish/Core/Persistence/Legacy/EzcDbHandler.php

@@ -41,6 +41,19 @@ public function __construct( ezcDbHandlerWrapped $ezcDbHandler )
         $this->ezcDbHandler = $ezcDbHandler;
     }
 
+    public function setDbHandler( ezcDbHandlerWrapped $ezcDbHandler )
+    {
+        $this->ezcDbHandler = $ezcDbHandler;
+    }
+
+    /**
+     * @return \ezcDbHandler
+     */
+    public function getDbHandler()
+    {
+        return $this->ezcDbHandler;
+    }
+
     /**
      * Factory for getting EzcDbHandler handler object
      *