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When some queries finished, but we got no result, it should
be a simple NotFoundError. Only when every single query ended
in error do we externalize those to the client, in case
something major is going wrong

This commit moves the record validation/verification
from dht/ into the new record/ packaage. Validator object
-- which is merely a map of ValidatorFuncs -- with a
VerifyRecord

cc @whyrusleeping

this time, without loading the private key on every startup

mitigated adding our own addresses where received
from peers

see #573

fix ping test

use dht bootstrap. there is an edge case where the dht
is tiny (1?) and we have 0 bootstrap peers. we should
probably _inform_ the user, but this may be more a
webui or command thing.

This also makes it an Error to find a peer.

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

This is causing test failures because tests don't usually
have "/-/-" format. we can decide whether or not to allow
keys without validators, but for now removing.

cc @whyrusleeping

mocknet indeterminism screwed this test up. that's twice
it's bitten us. let's not let it do it a third time.

cc @briantigerchow omg.

TestGetFailures may just be operating very slowly, instead
of completely failing. Right now it gets caught on travis
often. not sure if its actually wrong.

The net package is the next to move. It will be massaged
a bit still to fix the Network / "NetworkBackend" conflict.

The crypto package moves into p2p. Nothing in it so far is ipfs
specific; everything is p2p-general.

I think it's time to move a lot of the peer-to-peer networking
but-not-ipfs-specific things into its own package: p2p.
This could in the future be split off into its own library.
The first thing to go is the peer.

swarmnet is a better name for the package, because
it's just a Network implemented with a Swarm.
(ipfsnet will be something slightly different).

I needed the network implementation in its own
package, because I'll be writing several services that
will plug into _it_ that shouldn't be part of the core net
package. and then there were dependency conflicts. yay.
mux + identify are good examples of what i mean.