[Merge] ~ubuntu-server-dev/ubuntu/+source/ceph:xnox-groovy into ~ubuntu-server-dev/ubuntu/+source/ceph:ubuntu/groovy

[Chris MacNaughton]

Review: Approve

Looks good to me and support does seem to have landed in the Boost packages for s390x
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https://code.launchpad.net/~ubuntu-server-dev/ubuntu/+source/ceph/+git/ceph/+merge/387128
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