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Updates the version of go-libp2p-core and go-libp2p-testing

This has temporarily been disabled due to the changes/issues described in:

https://github.com/libp2p/specs/issues/111

fixes #177

1. Rely on the peerstore to extract the public key instead of doing so
internally (centralize).
2. Update the tests for the changes in go-libp2p-peer.
3. Update a bunch of deps (including go-libp2p-crypto, go-log, etc.)
4. Remove unnecessary progress bar dependency.