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fixes #177

Note: this does mean that the DHT won't work with peer keys by default and that
the constructor signature changes. Given all the changes that'll come with the
libp2p refactor, I don't feel too bad about this.

GetValues was very DHT specific so the routing interface has been updated to
remove that function. Instead, it has introduced general-purpose options.

This is a minimal alternative to #141 to avoid bundling too many changes
together.

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.

This is to testify that go-libp2p-kad-dht last release (3.0.17)
contains breaking changes. Bumping the major version.