Feature/vehicle gate parametrize acc (autowarefoundation#320)

* [vehicle_cmd_gate] add acc parameters

Signed-off-by: TakaHoribe <horibe.takamasa@gmail.com>

* fix typo

Signed-off-by: TakaHoribe <horibe.takamasa@gmail.com>

* Update control_launch/config/vehicle_cmd_gate/vehicle_cmd_gate.param.yaml

Co-authored-by: tkimura4 <tomoya.kimura@tier4.jp>

Co-authored-by: Daisuke Nishimatsu <42202095+wep21@users.noreply.github.com>
Co-authored-by: tkimura4 <tomoya.kimura@tier4.jp>

launch/control_launch/config/vehicle_cmd_gate/vehicle_cmd_gate.param.yaml

@@ -3,7 +3,8 @@
     update_rate: 10.0
     system_emergency_heartbeat_timeout: 0.5
     external_emergency_stop_heartbeat_timeout: 0.0
-
+    stop_hold_acceleration: -1.5
+    emergency_acceleration: -2.4
     vel_lim: 25.0
     lon_acc_lim: 5.0
     lon_jerk_lim: 5.0