multimds: fix pjd overrides for fuse_default_permissions

Set the default (off) in the ceph task directly, so that there is only a
single overrides field that reenables.  Otherwise, the two overrides
fight each other with undefined precedence.

Signed-off-by: Sage Weil <sage@redhat.com>
marginal: fix pjd overrides for fuse_default_persmissions

Signed-off-by: Sage Weil <sage@redhat.com>
Merge pull request #56 from ceph/wip-pjd

multimds: fix pjd fuse_default_permissions

Reviewed-by: Greg Farnum <greg@inktank.com>