Define required parameters

software/cdn-test/instance-input-schema.json

@@ -14,5 +14,6 @@
       "description": "MD5 checksum of QCOW2 vm-bootstrap compatible image.",
       "type": "string"
     }
-  }
+  },
+  "required": ["image-to-test-url", "image-to-test-md5sum"]
 }