LU-15338 tests: check whole jobid in sanity 205a

LU-15338 tests: check whole jobid in sanity 205a

Check the whole jobid string in sanity test_205a to avoid matching
a substring of the jobid twice.  This could only currently happen
for the second "dd" test, at a rate about 1/8192, but might also
fail in the future if other tests are added.

Lustre-change: https://review.whamcloud.com/45774
Lustre-commit: 1ee894a4355ecec869754c0b6c566c0e187e27a7

Test-Parameters: trivial testlist=sanity env=ONLY=205a,ONLY_REPEAT=200
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I34b7ed1a7825e3fbad9ea8666fccb2bdc53ebbe5
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52294
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>