delete the sandbox volume on termination

playbooks/roles/launch_ec2/tasks/main.yml

@@ -47,7 +47,7 @@
     region: "{{ region }}"
     instance_tags: "{{ instance_tags }}"
     volumes:
-      - device_name: /dev/sda
+      - device_name: /dev/sda1
         volume_size: "{{ root_ebs_size }}"
         delete_on_termination: true
     zone: "{{ zone }}"