ceph-volume: support crimson osd binary

ceph-volume: support crimson osd binary

Prior to this commit, ceph-volume was using hardcoded OSD binary
to issue commands (eg - to perform mkfs, etc). This commit enables
ceph-volume to start supporting crimson OSDs.

A new argument, --osd-type is introduced with the default value
classic. When this parameter is set to 'crimson', ceph-osd-crimson
binary will be used to execute OSD commands.

Signed-off-by: Shraddha Agrawal <shraddha.agrawal000@gmail.com>