Reduce locking in nfqueue and netlink

Gopkg.lock

@@ -140,15 +140,15 @@
   revision = "2bc1f35cddc0cc527b4bc3dce8578fc2a6c11384"
 
 [[projects]]
-  digest = "1:4f0792bf942a61626dfdc06d228aa79783e51f214faacba73992a73f9485c0a8"
+  branch = "master"
+  digest = "1:1f6a000c4fe2eaf76f506ecc23e859e1a5b81c0ec3039c5fca21bfbb80c43979"
   name = "github.com/mdlayher/netlink"
   packages = [
     ".",
     "nlenc",
   ]
   pruneopts = ""
-  revision = "ad88bf8eff5c1fd8d6a29299addeeb23d05f1ec1"
-  version = "v1.1.0"
+  revision = "ded538f7f4be5ec9a64b7a16c7fdb0bc66bfb85b"
 
 [[projects]]
   digest = "1:508f444b8e00a569a40899aaf5740348b44c305d36f36d4f002b277677deef95"
@@ -276,7 +276,10 @@
   branch = "master"
   digest = "1:ae1578a64c2b241c13ab243739d05936d83825d2b6e9ff043ea3c7105666493d"
   name = "golang.org/x/sync"
-  packages = ["errgroup"]
+  packages = [
+    "errgroup",
+    "singleflight",
+  ]
   pruneopts = ""
   revision = "6e8e738ad208923de99951fe0b48239bfd864f28"
 
@@ -390,6 +393,7 @@
     "golang.org/x/net/ipv4",
     "golang.org/x/net/publicsuffix",
     "golang.org/x/sync/errgroup",
+    "golang.org/x/sync/singleflight",
     "golang.org/x/sys/unix",
     "golang.org/x/sys/windows",
     "golang.org/x/sys/windows/svc",