Missing TimeSeriesCleared events when deleteNode() called

[yichen88]

• Do you want to request a feature or report a bug?

I am not sure it is a bug or is designed as it.
In cassandra implementation but i think it also exists in mapdb implementation as they share the same test suit.

• What is the current behavior?

        // data
        removeAllData(nodeUuid, statements);

        // time series
        clearTimeSeries(nodeUuid, statements);

The difference is :
in removeAllData which would call private removeData in which there is a push event.

But there is no push event in private clearTimeSeries

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

• What is the expected behavior?

• What is the motivation / use case for changing the behavior?

• Please tell us about your environment:

  • PowSyBl Version: ...
  • OS Version: ...

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, spectrum, etc)

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