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initial implementation of repo-gc command

fix #424: when adding blocks, provide to exchange asynchronously

@jbenet

would like it to work this way

@jbenet

p2p/net/conn: only reuseport if avail

benchmark CLI `ipfs add`

races: fix race conditions

@whyrusleeping @jbenet newly initialized datastores were being dumped
into ./go-ipfs. Eeek. An oversight during the FSRepo refactor. Not sure
how this bug survived this long.

p2p/net/conn: reuse listen tcp port to dial

This commit cleans up the reuse port setup, and fixes a problem:
make sure to filter addrs out that we simply cannot dial with
(e.g. loopback -> non-loopback, or linklocal -> nonlinklocal)

This commit finally makes use of the sent observed addrs.
If the connection's local address is from one of our
listen addrs, then the remote's observed addr is its
natted mapping, which is useful to us. For now, we add
it directly to our address book. (a future commit should
make addressbook addresses expire)