vendor latest containers/psgo

Signed-off-by: Valentin Rothberg <vrothberg@suse.com>

Closes: #1162
Approved by: rhatdan

vendor/github.com/containers/psgo/internal/proc/ns.go

@@ -0,0 +1,15 @@
+package proc
+
+import (
+	"fmt"
+	"os"
+)
+
+// ParsePIDNamespace returns the content of /proc/$pid/ns/pid.
+func ParsePIDNamespace(pid string) (string, error) {
+	pidNS, err := os.Readlink(fmt.Sprintf("/proc/%s/ns/pid", pid))
+	if err != nil {
+		return "", err
+	}
+	return pidNS, nil
+}