cmdfilter: extend default read filter

This patch adds the commands that the former sg filter allowed for read
access to the cmdfilter to keep userspace apps that rely on them working.

Signed-off-by: Adel Gadllah <adel.gadllah@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --cc block/cmd-filter.c
Simple merge

diff --cc drivers/scsi/sg.c
Simple merge