Be smarter about multiple instances of the same vertex

                 Key: GIRAPH-78
             Project: Giraph
          Issue Type: Improvement
            Reporter: Jakob Homan

In a graph such as 
{noformat}a -> b, z
b -> c, z
c -> a, z
where vertices a,b,c and are hosted on one worker and z is hosted on another, 
it would be good to cache instances of z so a,b,c all point at the same 
instance, rather than generating multiple copies of the same remote vertex 
during vertex reading.  This is less important with primitive types and the 
recent work done there, but very useful for more complex types.  Since the 
vertex readers are in userland, it would be good to provide these facilities as 
a library implementing users can access. ]

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