qa/workunits/mon/pool_ops.sh: use expect_false

Signed-off-by: Sage Weil <sage@inktank.com>
qa/workunits/mon/pool_ops.sh: fix test

The pool create command doesn't take k/v pairs any more.

Signed-off-by: Sage Weil <sage@inktank.com>
Merge pull request #1546 from ceph/wip-fix-pools

fix pool ops test