enable version subcmd and --version flag for root cmd and all subcmds

Former-commit-id: a9e681d47d47f9f09a22d8479705f62672f509b7 [formerly b7d17db57156675b06897bc289fe616628a47abb] [formerly e06d3b13b547356fb928288b09aaaaf1a60b8950 [formerly b4708348c680385d1d89f14bea7c7a0a883c6bf8]]
Former-commit-id: 43b18221e14269bada106e867b666f67a692c992 [formerly bee15f87fc2ecf5e8b4a0d74f41bde7617aef12a]
Former-commit-id: 733aaa6f3d5e3fc80dbb65ccc028d9f6ff6f73b7

cmd/users.go

@@ -18,10 +18,11 @@ func init() {
 }
 
 var usersCmd = &cobra.Command{
-	Use:   "users",
-	Short: "Users management utility",
-	Long:  `Users management utility.`,
-	Args:  cobra.NoArgs,
+	Use:     "users",
+	Version: rootCmd.Version,
+	Short:   "Users management utility",
+	Long:    `Users management utility.`,
+	Args:    cobra.NoArgs,
 }
 
 func printUsers(users []*users.User) {