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fixes #302

This commit extends the bitswap protocol with two additional wantlist properties:

* WANT_HAVE/HAVE: Instead of asking for a block, a node can specify that they
  want to know if any peers "have" the block.
* WANT_HAVE_NOT/HAVE_NOT: Instead of waiting for a timeout, a node can explicitly
  request to be told immediately if their peers don't currently have the given
  block.

Additionally, nodes now tell their peers how much data they have queued to send
them when sending messages. This allows peers to better distribute requests,
keeping all peers busy but not overloaded.

Changes in this PR are described in: https://github.com/ipfs/go-bitswap/issues/186

This ensures we don't keep large buffers allocated.

delay binding of network until a receiver is present. also add test of ipfs host network

Add comments to all exported functions, extract the utils for creating instances in testnet.go,
moves integration tests to bitswap_test

BREAKING CHANGE: removed one constant -- rebroadcastDelay -- which I believe was unused

This reverts commit fc1278e6.

It appears that using a buffer here is no longer necessary after the
upstream fix https://github.com/gogo/protobuf/pull/504

We now do exactly what the comment is warning about: track peers providing keys.

per https://github.com/golang/go/wiki/CodeReviewComments#comment-sentences

Let's not split every wantlist into a length and a wantlist...

Otherwise, we tie up the bitswap worker until the other side responds with an EOF.

fixes #5247
related to https://github.com/libp2p/go-libp2p-net/issues/28

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

alternative to #5243 that updates go-cid and all packages that depend on it

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

Updates:

* go-kad-dht: Query performance improvements, DHT client fixes, validates
  records on *local* put.
* go-libp2p-swarm/go-libp2p-transport: Timeout improvements.
* go-multiaddr-net: Exposes useful Conn methods (CloseWrite, CloseRead, etc.)
* go-log: fixes possible panic when enabling/disabling events.
* go-multiaddr: fixes possible panic when stringifying malformed multiaddrs,
  adds support for consuming /p2p/ multiaddrs.

fixes #5113
unblocks #4895

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

* go-log
* sys
* go-crypto

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

Note: This commit is technically broken. However, I need to make a bunch of
cmds changes to make this work and I'd rather not bundle both changes into a
single commit.

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>