suite: default to 9h results_timeout

6h isn't enough for xfstests.

Signed-off-by: Sage Weil <sage@inktank.com>
Merge pull request #286 from ceph/wip-results-timeout

suite: change default results_timeout to 9h (from 6h)

Reviewed-by: Josh Durgin <josh.durgin@inktank.com>