client: fix dispatcher ordering (broken fuse)

Objecter never saw any OSD maps because of 1e1ee480 and
the dispatchers being in the wrong order -- ignoring map
in Client was hiding it from Objecter.

Fixes: #9266

Signed-off-by: John Spray <john.spray@redhat.com>
Merge pull request #2351 from ceph/wip-9266

client: fix dispatcher ordering (broken fuse)

Reviewed-by: Sage Weil <sage@redhat.com>