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At this point I think this test should be moved out of this file

This test to make sure we can't run `ipfs init` while a daemon is
currently running.

This changes .go-ipfs to .ipfs everywhere.
And by the way this defines a DefaultPathName const
for this name.

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

- core: daemon stdout print to cmd + daemon init checks
- core: fixed bug where the gateway was printed as "API"
- sharness/test-lib: daemon init checks
- sharness/test-lib: portable TCP port check
- sharness/init: fix test bits output
- sharness: use common hashes in one place.
- move t0100-http-gateway -> t0111-gateway-writable
- sharness: test-lib funcs for gateway config
- sharness/t0111-gateway-writable: use sh funcs
- sharness/t0111-gateway-writable: fixes
  - escape all vars (always `cmd "$VAR"` never `cmd $VAR`)
  - use $FILEPATH, not $path
  - last test seems to fail

updated sharness hashes

closes #394 https://github.com/jbenet/go-ipfs/issues/394

kept bin in place

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).

I moved installed things into own dirs bin and lib.

@chriscool sorry to move things around again, the top level
test dir was getting a bit clutterd.

Addresses comments in: https://github.com/jbenet/go-ipfs/commit/7e14f1737d146cb45f3d788f229dae9fd964e524

The tests were using the globally installed ipfs.
This commit changes it to build + use its own ipfs binary.

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>