LU-14287 tests: Add 'fallocate' to racer

LU-14287 tests: Add 'fallocate' to racer

This patch adds fallocate(file_fallocate.sh)
under racer runs

Test-Parameters: trivial testlist=racer
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Signed-off-by: Mikhail Pershin <mpershin@whamcloud.com>
Change-Id: I8e807bfc5c2b29dfb610a0b35e7083a9609517b0
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/41663
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Deiter <alex.deiter@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>