Follow up to a24efaef, remove the mds from
the (mainly singleton) test configs that
explicitly list it.
Signed-off-by: John Spray <john.spray@redhat.com>
This is ignored by old teuthology, but used by newer code to tell us when
to generate a product of all directory items.
Signed-off-by: Sage Weil <sage@inktank.com>