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this is a major refactor of the entire codebase
it changes the monolithic peer.Peer into using
a peer.ID and a peer.Peerstore.

Other changes:
- removed handshake3.
-	testutil vastly simplified peer
-	secio bugfix + debugging logs
-	testutil: RandKeyPair
-	backpressure bugfix: w.o.w.
-	peer: added hex enc/dec
-	peer: added a PeerInfo struct
  PeerInfo is a small struct used to pass around a peer with
 	a set of addresses and keys. This is not meant to be a
 	complete view of the system, but rather to model updates to
 	the peerstore. It is used by things like the routing system.
-	updated peer/queue + peerset
-	latency metrics
-	testutil: use crand for PeerID gen
 	RandPeerID generates random "valid" peer IDs. it does not
 	NEED to generate keys because it is as if we lost the key
 	right away. fine to read some randomness and hash it. to
 	generate proper keys and an ID, use:
 	  sk, pk, _ := testutil.RandKeyPair()
 	  id, _ := peer.IDFromPublicKey(pk)
 	Also added RandPeerIDFatal helper
- removed old spipe
- updated seccat
- core: cleanup initIdentity
- removed old getFromPeerList

routing interface doesn't wait for value to appear in network, but value
doesn't appear in network until time as passed

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

Uses an inet.Dialer

this is the type of assumption we shouldn't violate.

See https://github.com/jbenet/go-ipfs/issues/153#issuecomment-63350535

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

for higher SnR at IPFS_LOGGING=info

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

for safety!

use mockpeer.WithID methods to create peers in tests

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

@jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

When performing this "promise" pattern, it is important to
provide a
channel with space for one value. Otherwise the sender may
block forever
in the case of a receiver that decides to abandon the
request. A subtle
detail, but one that is important for avoiding
leaked goroutines.

cc @whyrusleeping @jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

This commit makes GetProviders (sync) respect the request context. It
also amends all of GetProviders' callsites to pass a context in. This
meant changing the signature of the dht's handlerfunc.

I think I'll start referring to the request context as Vito Corleone.

cc @whyrusleeping @jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>