delete CombinedApplicationServer (#1763)

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You 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

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package org.apache.dolphinscheduler.api;

import org.apache.dolphinscheduler.alert.AlertServer;

import org.apache.dolphinscheduler.server.master.MasterServer;

import org.apache.dolphinscheduler.server.rpc.LoggerServer;

import org.apache.dolphinscheduler.server.worker.WorkerServer;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;

import org.springframework.boot.web.servlet.ServletComponentScan;

import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.context.annotation.Import;

import springfox.documentation.swagger2.annotations.EnableSwagger2;

@SpringBootApplication

@ConditionalOnProperty(prefix = "server", name = "is-combined-server", havingValue = "true")

@ServletComponentScan

@ComponentScan("org.apache.dolphinscheduler")

@Import({MasterServer.class, WorkerServer.class})

@EnableSwagger2

public class CombinedApplicationServer extends SpringBootServletInitializer {

    public static void main(String[] args) throws Exception {

        ApiApplicationServer.main(args);

        LoggerServer server = new LoggerServer();

        server.start();

        AlertServer alertServer = AlertServer.getInstance();

        alertServer.start();

    }

}