IPv6 support: token error on response when the address is not compacted

[gromain]

Hello,

I'm opening this issue in link with #37 .
I commented over there, but it went unnoticed, and it's an unrelated problem.

I'll write down below what I posted over here.

I'm sorry for reopening this issue, but there is still a little bug.

It's when you do a request with a full IPv6 (example fd01:0000:0000:3ead:c5b2:bad0:6bb1:6dbf) but when the response received only gives back the shortened address (aka fd01::3ead:c5b2:bad0:6bb1:6dbf).

I believe the trouble starts here (or end here ;-) ), line 108 in messagelayer.py, function receive_response. This function hashes the tuple (host, port, response.mid), with the data received in the response, and then tries to compare it with the hash made in the function send_request, in the same file at line 216.

So I believe the function parse_uri (here) could be modified to include a contraction of the consecutive 0 in IPv6 addresses.