upgrade suite for stress-split tests for d-f-x

Signed-off-by: tamil <tamil.muthamizhan@inktank.com>
Fix directory names.

Make sure that the directories formerly number 0 through 9 get
scanned in the right order.
Signed-off-by: Warren Usui <warren.usui@inktank.com>
Merge pull request #166 from ceph/upgrades_stress_split

upgrade suite for stress-split tests for d-f-x