Export Worker's Context/State to vertices through pre/post/Application/Superstep

                 Key: GIRAPH-47
                 URL: https://issues.apache.org/jira/browse/GIRAPH-47
             Project: Giraph
          Issue Type: Improvement
          Components: graph
    Affects Versions: 0.70.0
            Reporter: Claudio Martella

It would be quite useful for vertices to reach some worker-related information 
stored i.e. in the GraphState class.

This information could be exported as a parameter to 
pre/post/Application/Superstep like this:

public void preApplication(Configurable workerObject);
public void postApplication(Configurable workerObject);
public void preSuperstep(Configurable workerObject);
public void postSuperstep(Configurable workerObject);
public Configurable getWorkerObject();

Another possibility is to add a Context inner class to BasicVertex to store 
this information.

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