mon: osd-pool-create test enforce -e

mon: osd-pool-create test enforce -e

Use

   ! grep foo || exit 1

instead of

   grep foo && exit 1

so that all commands have a successful exit code. Otherwise set -e is
supposed to fail on them.

Reviewed-By: Christophe Courtaut <christophe.courtaut@gmail.com>
Signed-off-by: Loic Dachary <loic@dachary.org>