LU-18079 tests: updating getquota() in sanity-quota

LU-18079 tests: updating getquota() in sanity-quota

Updating getquota() in sanity-quota to use the new column parsing
options rather than parsing the entire output based on argument
offset which could break if the column order or argument number
was changed.

Updated lfs-quota.1 man page to include long options.

Signed-off-by: Frederick Dilger <fdilger@whamcloud.com>
Change-Id: I922a9c0c869ba18029d682220a38b2e0e0cdd91d
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56231
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: Oleg Drokin <green@whamcloud.com>