LU-18277 tests: Add missing env variable for acceptance-small

LU-18277 tests: Add missing env variable for acceptance-small

Although LUSTRE and NAME is defined once auster is
called via test-framwork.sh inclusion. It is still
undefined at this point making running standalone
acceptance-small.sh to fail. This patch defines
missing env variable LUSTRE and NAME when running
standalone accpetance-small.sh

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ib540f4ce7d56f6205f4d9e43bbc3b9e6db94511b
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56538
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Deiter <adeiter@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>