+ACTIVITY_CHANGE_VNF_STATE = "change-vnf-state"
+ACTIVITY_CHANGE_VNF_INSTANTIATION_STATE = "change-vnf-instantiation-state"
+ACTIVITY_SEND_NOTIFICATION_FOR_VNF = "send-notification-for-vnf"
+ACTIVITY_GET_TASK_QUEUE = "get_task_queue"
+ACTIVITY_GET_VNF_DETAILS = "get_vnf_details"
+ACTIVITY_SET_VNF_MODEL = "set-vnf-model"