LU-10038 test: ignore readdir races in sanity 133g

LU-10038 test: ignore readdir races in sanity 133g

In sanity test_133g() writing to some files (for example
mdt/*/exports/clear) may cause cause the proc tree to change while
find is running. Avoid errors in these cases by adding the
-ignore_readdir_race option to the find invocations.

Test-Parameters: trivial testlist=sanity

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I3ce61ee0f4e1041041d6872a0fe03488a9df363c
Reviewed-on: https://review.whamcloud.com/30451
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>