/agent/optional-plugins/apm-trace-ignore-plugin/apm-trace-ignore-plugin.config does not exist anymore, `optional-plugins` contains no folder in the latest release.
* 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