Just reraise
Just reraise

This patch removes hidding of traceback by reraising step exceptions
with SequenceError. It will make debugging easier.

Change-Id: Ifdb887b8d7cf2c226d7722abf414bdf5ee3628cd

fr34k8/packstack,palmer159/openstack-test,imcsk8/packstack,stackforge/packstack,mahak/packstack,fr34k8/packstack,stackforge/packstack,palmer159/openstack-test,openstack/packstack,imcsk8/packstack,stackforge/packstack,mahak/packstack,xbezdick/packstack,palmer159/openstack-test,openstack/packstack,openstack/packstack,xbezdick/packstack,fr34k8/packstack,imcsk8/packstack,mahak/packstack,xbezdick/packstack