LU-16250 tests: remove metadata-updates.sh script

LU-16250 tests: remove metadata-updates.sh script

The metadata-updates.sh test script doesn't really test anything
particularly interesting, and appears never to fail unless all of
the tests in that session fail, which indicates to me that anything
of interest that it might have tested has already been caught by
some earlier test. It has not been updated for anything except
test-framework changes in many years. The only minor part of interest
is write_disjoint, but that is also tested by parallel-scale (along
with more MPI tests).

Test-Parameters: trivial optional testgroup=review-dne-part-8
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I3891cf4cabdc777c2648a95fd821a376f7e6c87f
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/48913
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Deiter <alex.deiter@gmail.com>
Reviewed-by: Sarah Liu <sarah@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>