mgr/cephadm: add rados_id to nvmeof conf

mgr/cephadm: add rados_id to nvmeof conf

This is going to be used as the rados_id
to be set when connecting to the cluster using
the keyring we generate for the nvmeof daemon.

The python librados library defaults the name
to "client.admin" and so if we don't provide
a name or rados_id, we'll only be able to
use nvmeof with the "client.admin" keyring

Signed-off-by: Adam King <adking@redhat.com>
(cherry picked from commit 3e8ad229f79a16bddd85a77bf5273f3751e33f56)