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This is the first of multiple updates to ceph-osd where the OSD init code will be refactored for better sustainability. This patchset makes 2 changes: 1) Removes "ceph-disk" support, as ceph-disk was removed from the ceph image since nautilus. 2) Separates the initialization code for the bluestore, filestore, and directory backend configuration options. Change-Id: I116ce9cc8d3bac870adba8b84677ec652bbb0dd4