Remove OSD variable
Remove OSD variable

This variable is not used anywhere and is probably confusing for users.
We could potentially set a default for it (either `osd_ceph_disk` or
`osd_directory`). However given that both invocations are really
different we should not attempt to workaround. Thus the user has to set
the proper options.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

fmeppo/ceph-docker,JrCs/ceph-docker,h0tbird/ceph-docker,h0tbird/ceph-docker,rootfs/ceph-docker,streamnsight/ceph-docker,streamnsight/ceph-docker,smothiki/ceph-docker,smithfarm/ceph-docker,dmitryint/ceph-docker,ceph/ceph-docker,cdxvirt/ceph-docker,mkkie/ceph-docker,rochaporto/ceph-docker,streamnsight/ceph-docker,AcalephStorage/ceph-docker,fmeppo/ceph-docker,AcalephStorage/ceph-docker,lorieri/ceph-docker,lorieri/ceph-docker,ceph/ceph-docker,osixia/ceph-docker,alex1528/ceph-docker,cdxvirt/ceph-docker,CoRfr/ceph-docker,alex1528/ceph-docker,dmitryint/ceph-docker,smithfarm/ceph-docker,CoRfr/ceph-docker,rochaporto/ceph-docker,smithfarm/ceph-docker,h0tbird/ceph-docker,fmeppo/ceph-docker,JrCs/ceph-docker,mkkie/ceph-docker,osixia/ceph-docker,hookenz/ceph-docker,AcalephStorage/ceph-docker,dmitryint/ceph-docker,CoRfr/ceph-docker,rootfs/ceph-docker,lleszczu/ceph-docker,osixia/ceph-docker,alex1528/ceph-docker,rochaporto/ceph-docker,smothiki/ceph-docker,lorieri/ceph-docker,lleszczu/ceph-docker,JrCs/ceph-docker,hookenz/ceph-docker,hookenz/ceph-docker,smothiki/ceph-docker,lleszczu/ceph-docker