Noise: complete handshake process

TODO
- Figure out why `state.rs` is erased at some moment(even handshake
is not done).
- Refactor
- Add tests

libp2p/security/noise/exceptions.py

@@ -7,3 +7,16 @@ class NoiseFailure(HandshakeFailure):
 
 class HandshakeHasNotFinished(NoiseFailure):
     pass
+
+
+class InvalidSignature(NoiseFailure):
+    pass
+
+
+class NoiseStateError(NoiseFailure):
+    """Raised when anything goes wrong in the noise state in `noiseprotocol`
+    package."""
+
+
+class PeerIDMismatchesPubkey(NoiseFailure):
+    pass