examples: Add checksum to cirros-0.6.0 image

Author: markgoddard

examples/images.yml

@@ -47,6 +47,7 @@ openstack_image_cirros_0_6_0:
   name: "cirros-0.6.0"
   type: qcow2
   image_url: "https://github.com/cirros-dev/cirros/releases/download/0.6.0/cirros-0.6.0-x86_64-disk.img"
+  checksum: "md5:f4027b89e99e238184e13089a3155b74"
   is_public: True
   properties:
     os_type: "linux"