Pybind11 todos

[cissieAB]

• Revisit the result<T> bindings. It will influence existing EjfatURI and LBManager bindings and J notebooks.
• Some documentation of the existing bindings.

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Beyond MVP

• More bindings for methods in LBManager and ControlPlane, especially those related to protobuf.timestamp_pb2 and <boost/.../posix_time.hpp>.
• Python testing with real or mock control plane to mimic e2sar_lbcp_live_test.cpp.
• Other member functions of e2sarUtil.hpp except EjfatURI.
• Reassembler constructor with CPU core list.
• Segmenter constructor with iface?
• Test the pybind11 methods which are not included in the Jupyter notebooks or testing scripts.
• More documentation especially wiki page for LBManager.