LU-16694 tests: replace resolveip script

LU-16694 tests: replace resolveip script

The resolveip script can be replaced with a bash one-liner,
using getent and awk.

Lustre-change: https://review.whamcloud.com/50491
Lustre-commit: f8cc7db39dd22fdb6330402a60af7bb30c78449e

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Signed-off-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Change-Id: I207ea011e43b7b236d5082994ffb51654d8d782c
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/52781
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>