Add optional args arg back to do_list
Add optional args arg back to do_list

Without this change "heat list" does not work.

Change-Id: Ie0bc4d0964fcb9d7a5e3271b739f053eb1c701fd
Closes-Bug: #1278178

rdo-management/python-heatclient,ecerulm/python-heatclient,tcpcloud/python-heatclient,varunarya10/python-heatclient,varunarya10/python-heatclient,metacloud/python-heatclient,metacloud/python-heatclient,jasondunsmore/python-heatclient,rdo-management/python-heatclient,openstack/python-heatclient,tcpcloud/python-heatclient,jasondunsmore/python-heatclient,ecerulm/python-heatclient