Add /proc/scsi to masked paths

This is writeable, and can be used to remove devices. Containers do
not need to know about scsi devices.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
(cherry picked from commit a21ecdf3c8a343a7c94e4c4d01b178c87ca7aaa1)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

components/engine/oci/defaults.go

@@ -119,6 +119,7 @@ func DefaultLinuxSpec() specs.Spec {
 			"/proc/timer_list",
 			"/proc/timer_stats",
 			"/proc/sched_debug",
+			"/proc/scsi",
 		},
 		ReadonlyPaths: []string{
 			"/proc/asound",