virtcontainers: Remove /dev from the ignored system mounts

Since we want to handle certain files in /dev for k8s case,
remove /dev from the mounts list that we ignore.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

virtcontainers/mount.go

@@ -18,7 +18,7 @@ import (
 
 var rootfsDir = "rootfs"
 
-var systemMountPrefixes = []string{"/proc", "/dev", "/sys"}
+var systemMountPrefixes = []string{"/proc", "/sys"}
 
 func isSystemMount(m string) bool {
 	for _, p := range systemMountPrefixes {

virtcontainers/mount_test.go

@@ -31,7 +31,8 @@ func TestIsSystemMount(t *testing.T) {
 		{"/sys/fs/cgroup", true},
 		{"/sysfoo", false},
 		{"/home", false},
-		{"/dev/block/", true},
+		{"/dev/block/", false},
+		{"/mnt/dev/foo", false},
 	}
 
 	for _, test := range tests {