Code review comment for ~ddstreet/software-properties:simple_http_unix_connection

Found this in strace: "WARNING:root:name 'socket' is not defined, Retrying in 12.8 seconds..."

I added the missing import of `socket`, but then I got this from strace:

connect(9, {sa_family=AF_UNIX, sun_path=http+unix://%2Fvar%2Fsnap%2Fcanonical-livepatch%2Fcurrent%2Flivepatchd-priv.sock/disable}, 90) = -1 ENOENT (No such file or directory)

so it's not correctly decoding the socket path from the URL.