RemoteGraph Iterator Use vector read()

[vinceli1004]

Done So Far:
famgraph::RemoteGraph::Iterator::FillWindow now takes a std::vector<famgraph::VertexRange> instead of a single famgraph::VertexRange .

For each VertexRange, a raddr and length are calculated and added to a std::vector<FAM::FamSegment>, which is used to call the vector version of FAM::FamControl::Read.

TODO:

• famgraph::RemoteGraph::Iterator::Next() still passes in only a single VertexRange (a vector with size 1) to FillWindow()
  • famgraph::RemoteGraph::Iterator::MaximalRange should be made to return a std::vector<famgraph::VertexRange> of the VertexRanges that will fit into the window - capped at 40 (Note: Find the appropriate constant)
  • The return value from MaximalRange() should be passed into FillWindow() directly instead of being wrapped in a std::Vector
• Additional state may need to be added to the iterator to keep track of all the windows in the current buffer. For example, if we load in the edges for [1,2,3] and [4,5,6] we need a way to say that once we reach the end of 3, not to use RDMA for more edges because we already have [4,5,6] in the local buffer.
• Tests
  (Resolves Use vector overload of Read(), in RemoteGraph Iterator #16)