* Add SkyWalking plugin test framework doc

* Remove Chinese.

* Add a description to the env variable, CASE_SERVER_IMAGE_VERSION

* Fix typo

* Change paragraph structure.

* Update EtcdCoordinator.java

when EtcdCoordinator cannot connect to etcd cluster for a long time, 
the information registered in etcd will expire and refresh() function will not work.

* Not support copy all optional plugins

* fix

* Update test/plugin/run.sh

to correct the mistakes of grammar
Co-Authored-By: Nkezhenxu94 <kezhenxu94@163.com>

* redisson support high lv version

* bugfix

* add comment

* add redisson testcase

* fix elasticsearch query data window size too large error.

* make query max window size configurable.

* add webflux testcase

* [test/plugin] immigrate httpasyncclient scenario

* fix deficient code, "/socket.io/" http segment declare

* add agent test and fix expectedData.yaml file

* add listener on tomcat start, work for reduce socket io server start time
change "/socket.io/" operation "http.method", cause get or post will invoke both

* resolve style check error

* change socket io server and client start to health check servlet

* if startClientAndWaitConnect invoke on multi-thread, it will only check client ref, no check connect state, fix it.

*  Modify application.yml to set MySQL as storage provider

* use volume

This reverts commit d9fcda13.

* refactor:extract common module postgresql-common

* remove sql param tag.

* delete the deploy plugin

* Add postgresql agent sql query param show

* optimize

* fix license header

* Update scope-definitions.md

* Update Jenkinsfile

* check agent register status

* update

* remove healtch-check segment

* update

* fix some expectedData.yml

* remove netty-socketio-scenario from Jenkinsfile

* fix

Bring zhaopin.com to the powered by page

* feat: add support of mongodb v3.7.x or higher

* feat: remove mapping, using EnhancedInstance to mark remotePeer

* feat: add support of v3.6.x

* fix: disable support will 3.6.x, which will throw ClassCircularityError exception

* style: clean code

* fix support of 3.8.x~3.11.1, update test case and doc

* update stage name

* rename class

* rename stage

* Add register persistent worker latency metrics  #3671

* remove never thrown exception on Time#close()
add panel to mesh-mode-grafana.json

* remove never thrown exception on Time#close()
add panel to mesh-mode-grafana.json