LU-15846 tests: don't use comma-separated debug flags

LU-15846 tests: don't use comma-separated debug flags

To avoid test interop issues between 2.15 clients and 2.12/2.14
servers, don't use comma-separated debug flags in sanity-quota.sh
quota_init() and quota_fini().

Test-Parameters: trivial testlist=sanity-quota.sh env=ONLY=0 serverversion=2.14.0
Fixes: 6b6fde1026 ("LU-13055 libcfs: allow comma-separated masks")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ifca39054d14292bca8bcff9b8e03ae58fd5cc3a8
Reviewed-on: https://review.whamcloud.com/47308
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Wei Liu <sarah@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>