[Merge] ~rodrigo-barbieri2010/ubuntu/+source/nova:bug/1904580 into ~ubuntu-openstack-dev/ubuntu/+source/nova:master

[Corey Bryant]

This looks good, thanks for the fix. I'm going to merge and test before backporting to other releases. I've also added the following comment above the find command to clarify why we aren't changing the mode of  /var/lib/nova/.ssh/*:

# NOTE: /var/lib/nova/.ssh/ and its files aren't created by the package,
#       therefore don't change their mode.
-- 
https://code.launchpad.net/~rodrigo-barbieri2010/ubuntu/+source/nova/+git/nova/+merge/422028
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