This change removes "ceph-volume inventory" and "ceph-volume lvm
list" commands from the ceph-volume OSD initialization script and
Bluestore start script and replaces them with "pvdisplay" and
"lvs" to retrieve lvm tags directly from lvm volumes instead.
Ceph-volume makes repeated calls to blkid, which is very slow in
some cases and deadlocks in others when there are RBDs mapped on
the host.
Change-Id: Ia999770d4a59729e38dbb494b34c30e5a1b36a8b
a12ea0244e