LU-16023 tests: sanity-quota/8 should return success

sanity-quota/8 should return success explicitly

Test-Parameters: trivial testlist=sanity-quota
Fixes: bc69a8d058 ("LU-8621 utils: cmd help to stdout or short cmd error")
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: Id30bfd3e0bafedb6516471accbc0519cc640d2bd
Reviewed-on: https://review.whamcloud.com/47966
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Wei Liu <sarah@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>