ceph-volume: add available property in target specific flavors

ceph-volume: add available property in target specific flavors

This adds two properties available_[lvm,raw] to device (and thus inventory).
The goal is to have different notions of availability based on the
intended use case. For example finding LVM structures make a drive
unavailable for the raw mode, but might be available for the lvm mode.

Fixes: https://tracker.ceph.com/issues/43400
Signed-off-by: Jan Fajerski <jfajerski@suse.com>