Code review comment for ~raharper/cloud-init:cloud-test-add-pylint-and-fix

Thanks for doing this! Can you add comment to description/commit message about meta-data getting added to the integration tests?

Looks like a few tip-pylint errors, one of which is why I asked about getting rid of tools/hacking.py.

Otherwise I ran a full lxd and nocloud-kvm test run with no failures:
lxd: https://paste.ubuntu.com/26128706/
nocloud-kvm: https://paste.ubuntu.com/26128704/