LU-12470 tests: increase pdirops timeout

LU-12470 tests: increase pdirops timeout

There are pretty regular failures of the sanityn pdirops test_40-47.
Increase the timeout slightly to reduces the frequency of failures.

Fixes: 743b85a32e24 ("LU-2233 tests: improve tests sanityn/40-47")
Test-Parameters: trivial testlist=sanityn,sanityn,sanityn,sanityn
Test-Parameters: testlist=sanityn,sanityn,sanityn,sanityn,sanityn
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ie1ea5704edab97b61f563135b4cc2491dc3ebbe5
Reviewed-on: https://review.whamcloud.com/37304
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>