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(counting open connections requires copying)

Also, make the libp2p constructor fully useful. There should now be no need to
manually construct a swarm/host.

It is source of most warning noise in Warning channel and we would like
to enable warning channel some time in future by default

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

Closes #256

This way, we actually process disconnect notifications (and reduce the lifetime
on peer addr records).

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.

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.

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.

* Fix the tests to work with separate reset/close methods.
* Ensure we interrupt writes on reset.
* Always delay the proper time even if we're sending short messages.
* Copy buffers as we send them. `Write` is not allowed to hang onto buffers. If
  we run into performance issues, we can always add a buffer pool.

The legacy interface stays unchanged with a panic though.

There were previously 4 different ways of passing various options
into BasicHost construction.

1. Function parameters to New
2. Option parameters to New
3. Global variables, e.g. NegotiateTimeout
4. Options struct, in the calling code in go-ipfs

This changeset deprecated all of these, and introduces the HostOpts
struct to replace them. It also introduces a new constructor called
NewHost, which accepts a *HostOpts.

The old New constructor continues to work the same way,
but is from now on deprecated too.