dependencies: update netns to v0.0.4

Signed-off-by: Humble Chirammal <humble.devassy@gmail.com>

vendor/github.com/vishvananda/netns/.golangci.yml

@@ -0,0 +1,2 @@
+run:
+  timeout: 5m

vendor/github.com/vishvananda/netns/README.md

@@ -49,14 +49,3 @@ func main() {
 }
 
 ```
-
-## NOTE
-
-The library can be safely used only with Go >= 1.10 due to [golang/go#20676](https://github.com/golang/go/issues/20676).
-
-After locking a goroutine to its current OS thread with `runtime.LockOSThread()`
-and changing its network namespace, any new subsequent goroutine won't be
-scheduled on that thread while it's locked. Therefore, the new goroutine
-will run in a different namespace leading to unexpected results.
-
-See [here](https://www.weave.works/blog/linux-namespaces-golang-followup) for more details.

vendor/github.com/vishvananda/netns/netns_linux.go

@@ -2,7 +2,6 @@ package netns
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -136,7 +135,7 @@ func GetFromDocker(id string) (NsHandle, error) {
 
 // borrowed from docker/utils/utils.go
 func findCgroupMountpoint(cgroupType string) (int, string, error) {
-	output, err := ioutil.ReadFile("/proc/mounts")
+	output, err := os.ReadFile("/proc/mounts")
 	if err != nil {
 		return -1, "", err
 	}
@@ -166,7 +165,7 @@ func findCgroupMountpoint(cgroupType string) (int, string, error) {
 // borrowed from docker/utils/utils.go
 // modified to get the docker pid instead of using /proc/self
 func getDockerCgroup(cgroupVer int, cgroupType string) (string, error) {
-	dockerpid, err := ioutil.ReadFile("/var/run/docker.pid")
+	dockerpid, err := os.ReadFile("/var/run/docker.pid")
 	if err != nil {
 		return "", err
 	}
@@ -178,7 +177,7 @@ func getDockerCgroup(cgroupVer int, cgroupType string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	output, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/cgroup", pid))
+	output, err := os.ReadFile(fmt.Sprintf("/proc/%d/cgroup", pid))
 	if err != nil {
 		return "", err
 	}
@@ -265,7 +264,7 @@ func getPidForContainer(id string) (int, error) {
 		return pid, fmt.Errorf("Unable to find container: %v", id[:len(id)-1])
 	}
 
-	output, err := ioutil.ReadFile(filename)
+	output, err := os.ReadFile(filename)
 	if err != nil {
 		return pid, err
 	}

vendor/github.com/vishvananda/netns/nshandle_linux.go

@@ -30,7 +30,7 @@ func (ns NsHandle) Equal(other NsHandle) bool {
 // String shows the file descriptor number and its dev and inode.
 func (ns NsHandle) String() string {
 	if ns == -1 {
-		return "NS(None)"
+		return "NS(none)"
 	}
 	var s unix.Stat_t
 	if err := unix.Fstat(int(ns), &s); err != nil {

vendor/github.com/vishvananda/netns/nshandle_others.go

@@ -17,7 +17,7 @@ func (ns NsHandle) Equal(_ NsHandle) bool {
 // It is only implemented on Linux, and returns "NS(none)" on other
 // platforms.
 func (ns NsHandle) String() string {
-	return "NS(None)"
+	return "NS(none)"
 }
 
 // UniqueId returns a string which uniquely identifies the namespace