* 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
* 1. Fixed the bug of the cluster node sync failure cause by curator instance cache is null.
2. Fixed the bug of the collection in remote data builder is not initialized.
* 1. Re-generate indicator.
* Fixed the bug of the collection in remote data builder is not initialized.
* Fixed the bug of the remote client created but not initialize.