Just as with the mon, mgr, mds, rgw, and rbd-mirror daemons, do not
generate a ceph.conf in an init container for directory-based OSDs.
Instead use the mon config database and the commandline to supply all
the needed arguments for running these OSDs.
Also generate a keyring secret to mount to OSD pods. Use this
secret for directory-based OSDs for now with the intention to
use this for other OSDs in the future.
Signed-off-by: Blaine Gardner <blaine.gardner@suse.com>