* Move submodule plugin.

* Always auto-submodule

* [maven-release-plugin] prepare release v6.1.0

* [maven-release-plugin] prepare for next development iteration

* Change keys location.

* Fix #2546

* Change the stackdepth type

* Fix bug

* Fix CI failed

Update all "incubator-skywalking" to "skywalking" ,"incubator-servicecomb-java-chassis" to "servicecomb-java-chassis" correctly, and ".gitmodules" will update at #2531 (#2548)

* vertx plugin impl

Modify postgresql-8.x-plugin CreateStatementInterceptor.java statementName from CallableStatement to Statement

- found the unnecessary else block and remove it
- add test cover when AMQP.BasicProperties had null headers or headers Map had null value keys

issue #2450

* Fix npe

* support dubbo 2.7.x

* updated

* rename package

* rename package

* fix UT

* rename class

1. Fixed the warning of 'parent.relativePath' points issue when running the mvn package command. (#2404)

2. Fixed the warning of duplicate declaration of plugin issue when running the mvn package command.
3. Fixed the warning of duplicate declaration of mysql connector jar when running the mvn package command, because of provided scope include test scope.
4. Fixed the warning of expression ${artifactId} is deprecated issue when running the mvn package command.
5. Fixed the warning of expression ${version} is deprecated issue when running the mvn package command.

* fix issue #2258

* fix #2097 #1947

* remove Description and date tag

* split the diferent version to different plugins

* resolve conflict

* record all ips on multiple host mode of mysqlconnector-5x

* fix jdk 6.x

* optimise the code

* optimise code

* modify class name

* fix #2097 #1947

* i do not think it is a good idea to move the Instrumentation to mysql-common,the better way is extract a public method to return the InteceptorPionts in mysql-common

* fix #2097 #1947

* remove witnessClasses of subclasses

* Fix ArrayIndexOutOfBoundsException when intercepting net.spy.memcached.MemcachedClient.getStats()

* revert format

* Fixed an error that took a non-protocol uri string as a java.net.URL construct parameter.

* Fixed an error that took a non-protocol uri string as a java.net.URL construct parameter.

* Fixed checkstyle error.

* [maven-release-plugin] prepare release v6.0.0-GA

* [maven-release-plugin] prepare for next development iteration

* plugin support redisson

* Support Gson plugin

* Fix application cannot start when the dubbo interface with @RequestMapping

* fix add Canal plugin

* fix add UnitTest

* fix   format pom.xml

* Delete CanalApplication.java

* fix support cluster url

* fix add Licensed

* fix bug

* fix

* Support webflux and spring mvc 5 plugin

* Change instrumentation

* Change instrumentation

* fix check style

* Add support 2.1.x instrumentation

* Support overwrite tag

* Fix test case

* Fix support rabbitmq plugin

* fix Unit test rename sw3 to sw6

* Update pom.xml

* fix adjust rabbitmq Unit test

* fix add rabbitmq component in docker component-libraries.yml

* Update RabbitMQProducerInterceptor.java

* Update RabbitMQProducerInterceptor.java

* Fix the components of Spring resttemplate is incorrect

* Fix check style

* Fix the version is incorrect

* Fix checkstyle

* Update new protocol

* Support new protocol at agent side.

* Fix test case.

* Make backend supports new trace protocol

* Fix tests.

* Make all new services available in gRPC.

* Fix bugs.

* Finish new document for v2 trace protocol.

* Fix wrong version requirement of zk

* Fix trace query bug.

* Find a client side dictionary bug.

* Fix register bugs.

* Fix break doc links.