Doctrine_Manager::resetInstance() is not restting all properties

Calling Doctrine_Manager::resetInstance() resets the instance, however opening a new instance (and new connections) produces an error in the line 221 of Doctrine_Connection:

$this->getAttribute(Doctrine_Core::ATTR_LISTENER)->onOpen($this);

Which is because Doctrine_Manager::setDefaultAttributes() has a static variable $init in that function, hence reset instance is not resetting it and new manager instance looses default attributes.

Proposed fix: move $init variable to the object level.