* Register start up.

* Service inventory register test success.

@peng-yongsheng Found you have two `endpoint` concepts in different package. I have rename the one in register, the new is `endpointInventory*`. Because the register and meta data of the cluster should be named inventory.

* Refactor register and analysis modules.

* Fixed the startup error.

* Use annotation to instead of definition file.

* Use elasticsearch's document version to implement a lock for register source id.

* Return false when could not lock the document.

* Add commons-logging bridge for elastic search client.

* Rename receiver package name.

* Storage and Persistence.

* Storage config.

* Fixed the CI failure.

* Sample operator code.

* Indicator aggregator framework.

* Provide some annotation for OAL.

* Remote module.

* Register service.

* Add apache license header.

* Ignore comments when load definition files.

* Sample operator code.

* Indicator aggregator framework.

* Provide some annotation for OAL.

# 1447
Use `GET /api/v1/watch/namespaces/{namespace}/pods` api to watch pod's
containerIp which help collector containers to discovery each other.

* Receiver, aggregate, server finished.