Move container.json and pid file into a root specific driver dir

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

sysinit/sysinit.go

@@ -55,6 +55,7 @@ func SysInit() {
 		driver     = flag.String("driver", "", "exec driver")
 		pipe       = flag.Int("pipe", 0, "sync pipe fd")
 		console    = flag.String("console", "", "console (pty slave) path")
+		root       = flag.String("root", ".", "root path for configuration files")
 	)
 	flag.Parse()
 
@@ -82,6 +83,7 @@ func SysInit() {
 		Driver:     *driver,
 		Console:    *console,
 		Pipe:       *pipe,
+		Root:       *root,
 	}
 
 	if err := executeProgram(args); err != nil {