LU-17990 tests: sanity 33hh MDT index match often

LU-17990 tests: sanity 33hh MDT index match often

test_33hh in sanity.sh failed likely due to random chance as
occasionally the generation of names will only contain only numbers
or only letters.

To reduce the chance of this being an issue, if the test fails it
will re-run up to 3 times internally, after which if there is still
an issue something is surely wrong and it will fail.

Test-Parameters: trivial testlist=sanity env=ONLY=33hh,ONLY_REPEAT=100
Test-Parameters: trivial testlist=sanity env=ONLY=33hh,ONLY_REPEAT=100

Signed-off-by: Frederick Dilger <fdilger@whamcloud.com>
Change-Id: I4385bd2621f1305e9c11b27f9eb67f9a45aa606a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55611
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>