* 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.

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.

* Correct trace id.

* Fix match.

* Add cover token to retry.

* Retry new test plugin.

* Reset to jacoco.

* Update jacoco version.

* fix incorrect version in apm-checkstyle.

* remove SNAPSHOT in checkstyle module.

* Lock oracle and resin plugins version.

* Move resin and oracle plugin to openskywalking

* Restore submodule active.

* Add another submodule active command.

* Remove the wrong test cases in release and fix some doc issues.

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

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

* Fix some doc

* Change version 

* [maven-release-plugin] prepare release apm-5.0.0-alpha

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

* Create style check module.

* Add scm, licenses, mailing lists into root pom.

* Add jacoco and coveralls maven plugin into check style module’s pom.