nvme-cli: add --quiet option

nvme-cli: add --quiet option

Now we are going to have discovery log change events, so
instead of trying to figure out which NVM subsystem ports
are already connected, we let the driver do that and
only suppress the failure messages.

Example:
  nvme connect-all ... --quiet

This option will be used by the discovery log change corresponding
udev rule.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>