Scripts: removed unnecessary start script for USB cameras

scripts/usb_camera.sh

-#!/usr/bin/env bash
-
-###############################################################################
-# Copyright 2017 The Apollo Authors. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-###############################################################################
-
-
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-
-cd "${DIR}/.."
-
-source "${DIR}/apollo_base.sh"
-
-function start() {
-    LOG="${APOLLO_ROOT_DIR}/data/log/usb_cam.out"
-    CMD="cyber_launch start /apollo/modules/drivers/usb_cam/launch/usb_cam.launch"
-    NUM_PROCESSES="$(pgrep -c -f "modules/drivers/usb_cam/dag/camera.dag")"
-    if [ "${NUM_PROCESSES}" -eq 0 ]; then
-       eval "nohup ${CMD} </dev/null >${LOG} 2>&1 &"
-    fi
-}
-
-function stop() {
-    eval "nohup cyber_launch stop /apollo/modules/drivers/usb_cam/launch/usb_cam.launch < /dev/null 2>&1 &"
-}
-
-# run command_name module_name
-function run() {
-    case $1 in
-        start)
-            start
-            ;;
-        stop)
-            stop
-            ;;
-        *)
-            start
-            ;;
-    esac
-}
-
-run "$1"