Merge pull request #2366 from Diffblue-benchmarks/add-unit-tests-for-com.ctrip.framework.apollo.core.utils.StringUtils

Add unit tests for com.ctrip.framework.apollo.core.utils.StringUtils

fix ldap userId with case problem

These tests were written using Diffblue Cover

docker-compose.yml sample:
------------------------------------------------------------------------------------------
version: '3'
services:
  apollo-portal:
    image: docker.io/xzxiaoshan/apollo-portal:1.4.0
    container_name: apollo-portal
    network_mode: "host"
    environment:
      SERVER_PORT: 5555
      # DataSource Info
      DS_URL: "jdbc:mysql://pro.shanhy.com:3306/ApolloPortalDB?characterEncoding=utf8"
      DS_USERNAME: "shanhy"
      DS_PASSWORD: "xzxiaoshan@123"
      # Environmental variable declaration (meta server url, different environments should have different meta server addresses)
      DEV_META: "http://dev.shanhy.com:6666"
      FAT_META: ""
      UAT_META: ""
      LPT_META: ""
      PRO_META: "http://pro.shanhy.com:6666"
    depends_on:
      - apollo-adminservice
    logging:
      driver: "json-file"
      options:
        max-size: "200k"
        max-file: "10"

  apollo-configservice:
    image: docker.io/xzxiaoshan/apollo-configservice:1.4.0
    container_name: apollo-configservice
    network_mode: "host"
    environment:
      SERVER_PORT: 6666
      # DataSource Info
      DS_URL: "jdbc:mysql://pro.shanhy.com:3306/ApolloPortalDB?characterEncoding=utf8"
      DS_USERNAME: "shanhy"
      DS_PASSWORD: "xzxiaoshan@123"
    logging:
      driver: "json-file"
      options:
        max-size: "200k"
        max-file: "10"

  apollo-adminservice:
    image: docker.io/xzxiaoshan/apollo-adminservice:1.4.0
    container_name: apollo-adminservice
    network_mode: "host"
    environment:
      SERVER_PORT: 6667
      # DataSource Info
      DS_URL: "jdbc:mysql://pro.shanhy.com:3306/ApolloPortalDB?characterEncoding=utf8"
      DS_USERNAME: "shanhy"
      DS_PASSWORD: "xzxiaoshan@123"
    depends_on:
      - apollo-configservice
    logging:
      driver: "json-file"
      options:
        max-size: "200k"
        max-file: "10"

1.将服务端口提取到docker run的 -e SERVER_PORT 可指定，在docker需要使用host网络时，可以不用修改代码指定端口，避免与宿主机上的原有端口占用冲突 (#2333)

2.对docker CMD入口的startup.sh文件，增加可执行授权指令，防止在某些时候该文件被打包进入后没有执行权限的麻烦（已实际遇到，又回头重新打包）

search app from backend instead of loading all app and filter in frontend

 add tech-support-qq-4

For cases like #2162, there are other property source wrappers like jasypt, so we won't be able to decide whether to trigger this change or not.
So it's better just to trigger it as it is idempotent.