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This commit switches over to the new Close/CloseWrite/CloseRead interface
changes in go-libp2p-core 0.7.0.

This change also removes a now obsolete hack to implicitly clean up streams
after reading an EOF; calling Close or Reset is now required.

See: https://github.com/libp2p/go-libp2p-core/releases/tag/v0.7.0