support psutil's version compatiblity with OpenStack kilo
support psutil's version compatiblity with OpenStack kilo

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