Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Immigrate tests okhttp scenario

* Fix Header.

* Fix license Header.

* Modify code follow the reivew suggestions.

* Fix expected.xml

* Restore the missed config

* Update okhttp elapsed time.

* Update total time for Group1.

* Fix the missed operationNames.

* 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

* feat: add test case for mongodb-3.x-plugin

* fix: agent-test script error

* feat: change non-compliant code

* fix: remove not proper config

* docs: update docs

* Merge branch 'master' of https://github.com/apache/skywalking into mongodb-testcase

# Conflicts:
#	Jenkinsfile-Agent-Test-3

* immigrate dubbo

* provides a jvm-container

* Add e2e cluster tests

Fix IPMC checks for releasing.

* Add mechanism to disable any or all plugins, Relate: #186

2. Some class check style error.