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

fix #114

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

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

Add a peer id to an active partner queue

Make sure when request queues are idle that they are removed

fix #112

(fixes linter issues)

Each one is about 4 words wide (two for the CID, one for the priority, one for
the trash flag).

We allocate a _lot_ of these.

put trash field only where it is needed, in peer request queues

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

Wantlist/Blocks *copy*.

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.

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>

Updates:

* go-net
* go-text
* dns
* prometheus
* protobuf (golang, not gogo)

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: Łukasz Magiera <magik6k@gmail.com>

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

This moves the `thirdparty/pq` package to https://github.com/ipfs/go-ipfs-pq .

History has been retained. The new package has been gx'ed and published.
Imports have been updated accordingly.

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

This extracts the blocks/blockstore package and renames the
blocks/blockstore/util package to /blocks/blockstoreutil
(because util depends on Pin and I don't plan to extract
Pin and its depedencies).

The history of blocks/blockstore has been preserved. It has
been gx'ed and imported. Imports have been rewritten accordingly
and re-ordered.

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

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>

Avoids lots of reallocations under a lock.

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

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.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: keks <keks@cryptoscope.co>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: vyzo <vyzo@hackzen.org>

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: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>