Automatic tests

[NikolayBlagoev]

Add tests to make sure new changes work

[NikolayBlagoev]

• [x] Peer creation
• [x] Peer to/from bytes
• [x] Kademlia bucket tests
• [x] Kademlia protocol with several peers
• [ ] Noise protocol
• [ ] Gossip protocol
• [ ] stream protocol
• [ ] Fixed peers protocol
• [x] Protocol binding tests
• [x] hashes and signatures