Update cli package

The old one has bug when showing help message for IntFlags.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>

kill.go

@@ -61,10 +61,10 @@ For example, if the container id is "ubuntu01" the following will send a "KILL"
 signal to the init process of the "ubuntu01" container:
 	 
        # runc kill ubuntu01 KILL`,
-	Action: func(context *cli.Context) {
+	Action: func(context *cli.Context) error {
 		container, err := getContainer(context)
 		if err != nil {
-			fatal(err)
+			return err
 		}
 
 		sigstr := context.Args().Get(1)
@@ -74,12 +74,13 @@ signal to the init process of the "ubuntu01" container:
 
 		signal, err := parseSignal(sigstr)
 		if err != nil {
-			fatal(err)
+			return err
 		}
 
 		if err := container.Signal(signal); err != nil {
-			fatal(err)
+			return err
 		}
+		return nil
 	},
 }