fix mechanism drivers not found error
fix mechanism drivers not found error

Change-Id: I8ea13de095ee942af51a86fca62fa651ae8665b3

fr34k8/packstack,fr34k8/packstack,fr34k8/packstack,openstack/packstack,mahak/packstack,openstack/packstack,stackforge/packstack,mahak/packstack,mahak/packstack,openstack/packstack,stackforge/packstack,stackforge/packstack