Make sure our parent is always pid 1

oz-seccomp/seccomp.go

@@ -27,6 +27,11 @@ func Main() {
 		os.Exit(1)
 	}
 
+	if os.Getppid() != 1 {
+		log.Error("oz-seccomp wrapper much be called from oz-init!")
+		os.Exit(1)
+	}
+	
 	var getvar = func(name string) string {
 		val := os.Getenv(name)
 		if val == "" {