Add a bunch of linear workflow tests.
Add a bunch of linear workflow tests.

pombredanne/taskflow-1,jimbobhickville/taskflow,jessicalucci/TaskManagement,junneyang/taskflow,jimbobhickville/taskflow,junneyang/taskflow,pombredanne/taskflow-1,citrix-openstack-build/taskflow,jessicalucci/TaskManagement,openstack/taskflow,varunarya10/taskflow,citrix-openstack-build/taskflow,openstack/taskflow,varunarya10/taskflow