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feat(sessions): add rebroadcasting, search backoff

Re-setup provider search delay and rebroadcast delay on a per bitswap instance basis

Don't count consecutive ticks if there are no active wants

on a tick, do not keep searching for providers for the same block. instead rely on a periodic search
for more providers. (which will run no matter what, even w/o ticks, to optimize found providers).
also backoff tick time to reduce broadcasts.

fix #95, fix #107

testutil: fix block generator

dep: remove dep on libp2p/go-testutil

migrate to go-libp2p-core.

Update libp2p things

dep: tidy deps

feat(engine): tag peers with requests

fix(network): add mutex to avoid data race

tag peers in connection manager as they have outstanding requests for blocks to serve

fix #114

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

Change bitswap provide toggle to not be static

Use shared peer task queue with Graphsync

Uses shared external package peer task queue in place of peer request queue. Shared by graphsync.

Add missing godoc comments, refactor to avoid confusion

build(package management): remove gx

Instance generator was previously named session generator, which created confusion with bitswap
sessions

fix #101

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

As the rest of the IPFS project moves to go-mod, we no longer support gx

BREAKING CHANGE: No further GX versions of go-bitswap will be published

fix(decision): cleanup request queues

Add a peer id to an active partner queue

Make sure when request queues are idle that they are removed

fix #112

Control provider workers with experiment flag

connmgr: give peers more weight when actively participating in a session