osd: prevent old clients from using tiered pools

If the client is old and doesn't understand tiering, don't let them use a
tiered pool.  Reply with EOPNOTSUPP.

Fixes: #8714
Backport: firefly
Signed-off-by: Sage Weil <sage@redhat.com>
Merge pull request #2172 from ceph/wip-8714

osd: prevent old clients from using tiered pools

Reviewed-by: Samuel Just <sam.just@inktank.com>