check-netapp-ng.pl: fix the outpuf of '-T SHELF'

Signed-off-by: Davide Madrisan <davide.madrisan@gmail.com>
check-netapp-ng.pl: fix typo

Signed-off-by: Davide Madrisan <davide.madrisan@gmail.com>
Merge pull request #2 from madrisan/master

RFC - check-netapp-ng.pl