Add SNI and NOISE protocol in py-multiaddr

[lla-dane]

Added sni protocol in py-multiaddr in reference with go-multiaddr

SNI had the same codec configs as DNS in go-multiaddr

protoSNI = Protocol{
	Name:       "sni",
	Size:       LengthPrefixedVarSize,
	Code:       P_SNI,
	VCode:      CodeToVarint(P_SNI),
	Transcoder: TranscoderDns,
}

So just added this line in the protocol registry

Protocol(P_SNI, "sni", "domain"),

Did the same thing with noise

[lla-dane]

Also added a test case for sni multiaddr as given in go-multiaddr tests

[lla-dane]

@acul71: Can you please take a look why these checks are failing with my changes, I am not understanding.