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This commit prevents us from repeatedly extending the lifetimes of all observed
addresses if a peer keeps on reconnecting.

It also fixes two race conditions:

1. We may end up processing a disconnect after a re-connect and may
accidentally give the addresses associated with that peer a
RecentlyConnectedAddrTTL instead of a ConnectedAddrTTL.

2. We may end up processing a connect after the associated disconnect storing
the associated peer addresses indefinitely.

first hack at a nice libp2p constructor

Fixed typo.

Update Travis CI to use new test script and go 1.9.x

update gx deps

* msgio (moved)
* secio
* testutil

Fix "go vet" errors.

There's really no reason to *only* do this if we have relays enabled. Doing it
this way makes `go vet` happier and reduces conditional logic.

gx: update go-peerstream

Connmgr updates

allow tag to be passed into NewMdnsService

basic_host: fix warning message

make sure to not drop writes on close

Before, on close, we:

1. Weren't completing the write.
2. Flushing the buffer without waiting the latency delay.

This fixes that by using two separate channels for close/reset and ignoring the
close channel in deliverOrWait.

update go-stream-muxer