runtime: Switch userns packages

Switch imports to resolve:
```
SA1019: "github.com/opencontainers/runc/libcontainer/userns" is deprecated:
use github.com/moby/sys/userns
```

Signed-off-by: stevenhorsman <steven@uk.ibm.com>

src/runtime/go.mod

@@ -35,6 +35,7 @@ require (
 	github.com/hashicorp/go-multierror v1.1.1
 	github.com/intel-go/cpuid v0.0.0-20210602155658-5747e5cec0d9
 	github.com/mdlayher/vsock v1.2.1
+	github.com/moby/sys/userns v0.1.0
 	github.com/opencontainers/runc v1.2.0
 	github.com/opencontainers/runtime-spec v1.2.0
 	github.com/opencontainers/selinux v1.11.0
@@ -111,7 +112,6 @@ require (
 	github.com/moby/sys/signal v0.7.0 // indirect
 	github.com/moby/sys/symlink v0.2.0 // indirect
 	github.com/moby/sys/user v0.3.0 // indirect
-	github.com/moby/sys/userns v0.1.0 // indirect
 	github.com/oklog/ulid v1.3.1 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.0 // indirect

src/runtime/vendor/github.com/opencontainers/runc/libcontainer/userns/userns_deprecated.go

@@ -1,13 +0,0 @@
-// Deprecated: use github.com/moby/sys/userns
-package userns
-
-import "github.com/moby/sys/userns"
-
-// RunningInUserNS detects whether we are currently running in a Linux
-// user namespace and memoizes the result. It returns false on non-Linux
-// platforms.
-//
-// Deprecated: use [userns.RunningInUserNS].
-func RunningInUserNS() bool {
-	return userns.RunningInUserNS()
-}

src/runtime/vendor/modules.txt

@@ -438,7 +438,6 @@ github.com/opencontainers/runc/libcontainer/cgroups/fscommon
 github.com/opencontainers/runc/libcontainer/cgroups/systemd
 github.com/opencontainers/runc/libcontainer/configs
 github.com/opencontainers/runc/libcontainer/devices
-github.com/opencontainers/runc/libcontainer/userns
 github.com/opencontainers/runc/libcontainer/utils
 # github.com/opencontainers/runtime-spec v1.2.0
 ## explicit

src/runtime/virtcontainers/pkg/rootless/rootless.go

@@ -24,7 +24,7 @@ import (
 	"os"
 	"sync"
 
-	"github.com/opencontainers/runc/libcontainer/userns"
+	"github.com/moby/sys/userns"
 	"github.com/sirupsen/logrus"
 )
 

src/runtime/virtcontainers/pkg/rootless/rootless_test.go

@@ -9,7 +9,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/opencontainers/runc/libcontainer/userns"
+	"github.com/moby/sys/userns"
 	"github.com/stretchr/testify/assert"
 )