Switch to using ceph-volume + LVM for managing block devices
for Luminous and later; this is the upstream preferred approach
to managing OSD devices, allowing for more flexibility in terms
of use of crypto and logical volumes.
Change-Id: I30c4d29e6f568ac2e30a45b1a7bc0e68685c3707
Depends-On: I1675b67d364ae6042129a8a717d4bdffff5bde92