Updating to latest netns to fix amd64 / RPI issues

Signed-off-by: Madhu Venugopal <madhu@docker.com>

libnetwork/Godeps/Godeps.json

@@ -131,7 +131,7 @@
 		},
 		{
 			"ImportPath": "github.com/vishvananda/netns",
-			"Rev": "b7a04d6db3dce92b370e6d5b6ab9e2361a3c53e1"
+			"Rev": "493029407eeb434d0c2d44e02ea072ff2488d322"
 		}
 	]
 }

libnetwork/Godeps/_workspace/src/github.com/vishvananda/netns/netns_linux_arm.go

@@ -3,5 +3,5 @@
 package netns
 
 const (
-	SYS_SETNS = 374
+	SYS_SETNS = 375
 )