Merge pull request #126 from thaJeztah/18.09_backport_mask_asound

[18.09 backport] Masked /proc/asound
diff --git a/oci/defaults.go b/oci/defaults.go
index 992157b..8ba9240 100644
--- a/oci/defaults.go
+++ b/oci/defaults.go
@@ -114,6 +114,7 @@
 
 	s.Linux = &specs.Linux{
 		MaskedPaths: []string{
+			"/proc/asound",
 			"/proc/acpi",
 			"/proc/kcore",
 			"/proc/keys",
@@ -125,7 +126,6 @@
 			"/sys/firmware",
 		},
 		ReadonlyPaths: []string{
-			"/proc/asound",
 			"/proc/bus",
 			"/proc/fs",
 			"/proc/irq",