[Merge] ~chris.macnaughton/ubuntu/+source/ceph:ubuntu/lunar into ~ubuntu-server-dev/ubuntu/+source/ceph:ubuntu/lunar

[Chris MacNaughton]

This has built successfully in a PPA now, and I'm running autopkgtests on it to confirm it functions as expected on lunar-proposed
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https://code.launchpad.net/~chris.macnaughton/ubuntu/+source/ceph/+git/ceph/+merge/436565
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