Move patched quic-network-simulator to a more permanent space

[WesleyRosenblum]

Currently the performance benchmarks use a patched version of the quic-network-simulator living at https://github.com/WesleyRosenblum/quic-network-simulator. This version is patched to support TCP traffic through the simulator.

This should move to a more permanent location, ideally merging the patch back into https://github.com/marten-seemann/quic-network-simulator

[WesleyRosenblum]

This patched version is also now used to ensure address rebinds don't change the port scope, see https://github.com/WesleyRosenblum/quic-network-simulator/commit/b1d8ddf018d89e08ab88d7a229820870e5cb5256