add gitignore for test dir
add gitignore for test dir

cmusatyalab/elijah-provisioning,cmusatyalab/elijah-provisioning,cmusatyalab/elijah-provisioning,cmusatyalab/elijah-provisioning,OpenEdgeComputing/elijah-provisioning,cmusatyalab/elijah-provisioning,OpenEdgeComputing/elijah-provisioning,cmusatyalab/elijah-provisioning,OpenEdgeComputing/elijah-provisioning,OpenEdgeComputing/elijah-provisioning,OpenEdgeComputing/elijah-provisioning,OpenEdgeComputing/elijah-provisioning