Spring Cloud Config ConfigServerConfigDataLoader constructor should use DeferredLogFactory

Describe the bug

Spring cloud version : 4.0.0-SNAPSHOT

Spring cloud config client : ConfigServerConfigDataLoader debug level log is not working ConfigServerConfigDataLoader constructor should use DeferredLogFactory (see ConfigDataLoaders)

And i fixed it in #2063

Sample

My config client application.yml config is

spring:
  config:
    import:
      - "configserver:http://localhost:8888"
logging:
  level:
    org.springframework.cloud.config.client.ConfigServerConfigDataLoader: debug     

if constructor use

    public ConfigServerConfigDataLoader(Log logger) {
        this.logger = logger;
    }

Then debug level is not working. It should be

    public ConfigServerConfigDataLoader(DeferredLogFactory logFactory) {
        this.logger = logFactory.getLog(getClass());
    }

Reference : org.springframework.boot.context.config.ConfigDataLoaders

Comment From: ryanjbaxter

@ruansheng8 I saw you accidentally deleted the branch, can you open another PR, but this time submit it against the 3.1.x branch?