Add support for use of experimental bluestore storage format
for Ceph Jewel or later.
This will be exposed in the charms via a new configuration
option.
Change-Id: I36f7aa9d7b96ec5c9eaa7a3a970593f9ca14cb34
Helper functions for the ceph charms. This library has shared functionality that is used in the ceph-mon, ceph-osd and ceph
charms. Anything that needs to be shared across the ceph charms should live here.