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Without `-f`, `make clean` fails on machines that don't have the dir.

cc @jbenet

@jbenet @whyrusleeping

This bug (missing return) could tie up the client worker and cause
operations to come to a halt.

utp is BROKEN!! it causes tests to fail.

we shouldn't use an arbitrary timeout here. since Get
doesnt take in a context yet, we give a large upper bound.
think of an http request. we want it to go on as long as
the client requests it.

this commit adds a logger with prefixes

fix sharness test for ipfs init output

sharness: verbose output

Make sharness tests' output helpful when verbose.
This means cating certain files, or running diagnostic
commands. I used a construction like:

    test_expect_success ".go-ipfs/ has been created" '
      test -d ".go-ipfs" &&
      test -f ".go-ipfs/config" &&
      test -d ".go-ipfs/datastore" ||
      fsh ls -al .go-ipfs
    '

The `|| ...` is a diagnostic run when the preceding command
fails. `fsh` is a trivial script that echoes the args, runs
the cmd, and then also fails, making sure the test case fails.
(wouldnt want the diagnostic accidentally returning true and
making it _seem_ like the test case succeeded).

mount fixes

This commit cleans up how mounting was being done.
It now successfully signals when it is properly mounted
and listen to close signals correctly.

Stream relaying

not sure how it wasnt an error

This commit makes all network tests use ZeroLocalTCPAddress
as the initial peer address, and then relies on
net.ListenAddresses()

This should get rid of the tcp addr clash problems.

The separation of work in the p2p pkg is as follows:

- net implements the Swarm and connectivity
- protocol has muxer and header protocols
- host implements protocol muxing + services
- identify took over handshake completely! yay.
- p2p package works as a whole

using a placeholder net2 package so tests continue to pass.
Will be swapped atomically into main code.

remove comment about spdystream. this is now
superceded by go-peerstream interface.