[FAB-4130] fix peer node status error reports

This patch fixes [FAB-4130]. With this patch, "peer node status" command
shows error messages, and exits with an error code when they encounter
errors.

Change-Id: I08a1556336b82af505051a7674d9486d561b6bec
Signed-off-by: Taku Shimosawa <taku.shimosawa@hal.hitachi.com>

peer/node/status.go

@@ -34,8 +34,8 @@ var nodeStatusCmd = &cobra.Command{
 	Use:   "status",
 	Short: "Returns status of the node.",
 	Long:  `Returns the status of the running node.`,
-	Run: func(cmd *cobra.Command, args []string) {
-		status()
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return status()
 	},
 }