1.将原有的httpclient变为httpclient4.2的插件

skywalking-sdk-plugin/httpclient-plugin/src/main/java/com/ai/cloud/skywalking/plugin/httpclient/trace/HttpClientTracing.java → skywalking-sdk-plugin/httpclient-4.2.x-plugin/src/main/java/com/ai/cloud/skywalking/plugin/httpclient/v42x/HttpClientTracing.java

-package com.ai.cloud.skywalking.plugin.httpclient.trace;
+package com.ai.cloud.skywalking.plugin.httpclient.v42x;
 
 import com.ai.cloud.skywalking.buriedpoint.RPCBuriedPointSender;
 import com.ai.cloud.skywalking.conf.AuthDesc;

skywalking-sdk-plugin/httpclient-plugin/src/main/java/com/ai/cloud/skywalking/plugin/httpclient/SWTracingHttpClient.java → skywalking-sdk-plugin/httpclient-4.2.x-plugin/src/main/java/com/ai/cloud/skywalking/plugin/httpclient/v42x/SWTracingHttpClient.java

-package com.ai.cloud.skywalking.plugin.httpclient;
+package com.ai.cloud.skywalking.plugin.httpclient.v42x;
 
-import com.ai.cloud.skywalking.plugin.httpclient.trace.HttpClientTracing;
 import org.apache.http.HttpHost;
 import org.apache.http.HttpRequest;
 import org.apache.http.HttpResponse;