osd,disk: add --bluestore flag
osd,disk: add --bluestore flag

This will pass --bluestore on to ceph-disk during the prepare/create
step.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@redhat.com>

trhoden/ceph-deploy,Vicente-Cheng/ceph-deploy,codenrhoden/ceph-deploy,trhoden/ceph-deploy,ceph/ceph-deploy,SUSE/ceph-deploy,Vicente-Cheng/ceph-deploy,codenrhoden/ceph-deploy,SUSE/ceph-deploy,ceph/ceph-deploy