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I broke out multiaddr/net to its own package so
that multiaddr parsing could remain lean. multiaddr-net
will vendor special implementations of protocols (like utp)

@jbenet we may want to consider setting the default type to Remote. I
left the default as Unspecified just for safety.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

# TYPES
# feat
# fix
# docs
# style (formatting, missing semi colons, etc; no code change):
# refactor
# test (adding missing tests, refactoring tests; no production code change)
# chore (updating grunt tasks etc; no production code change)
Signed-off-by: Brian Tiger Chow <brian.holderchow@gmail.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

vanilla:
    21.57 real        45.14 user         8.51 sys

short:
    14.40 real        31.13 user         5.56 sys

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet

The check needed knowledge of the _listen_ addresses,
not just the interface addresses. Also, the handshake now
sends out all the addresses we accumulate about ourselves.
(this may be bad in the long run, but useful now to test)