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If Bitswap receives a block that isn't in it's wantlist, is should ignore it

fix #21 fix #22

gx publish 1.1.17

Feat/bitswap pr improvements

So that CI passes, and because it's not reliable as a test, and is more a benchmark to measure
performance, convert dup_block_test.go to a benchmark, which can be run using `go test -bench .`

delay finding providers

It's expensive and causes quite a bit of dialing. Let's give bitswap a second to
work it's magic before we try this.

fixes #16

buffer writes

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

reduce allocations

Wantlist/Blocks *copy*.

This was showing up as a major source of heap allocations (well, at least when
the DHT is in client-only mode).

1. Use a `taskEntryKey` *type* instead of a string (now that both peer IDs and
CIDs are hashable).
2. Get rid of all uses of `cid.KeyString` (mostly just for type safety). This
also means we don't need to parse the CID and allocate to convert it *back* from
a string.

bitswap: Bitswap now sends multiple blocks per message

fixes bs.GetSize bug

Updated PeerRequestTask to hold multiple wantlist.Entry(s). This allows Bitswap to send multiple blocks in bulk per a Peer's request. Also, added a metric for how many blocks to put in a given message. Currently: 512 * 1024 bytes. 

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>

gx: update go-libp2p-routing