Sharness macos no brainer fixes

Without reflecting this in the tests we do not actually shut down
correctly during cleanup

Some did actually prevent proper test shutdown

Set this to '1' if you are doing local dev and have redirects in go.mod

Docker on a mac might be available, but may not be runnng. The
way the original test was written is linux-specific anyway, so
just hoist the check into the DOCKER declaration

54b1969c correctly switched from nc to socat, but did not account for it
not being as widely available. Adjust tests that depend on it with the
correct message.

There are also a number of comments pertaining to nc - they were not
adjusted.

Support Asynchronous Datastores

fix: limit SW registration to content root

chore(dep): update go-libp2p

* Fixes a panic on close/write race in the websocket transport (https://github.com/libp2p/go-libp2p-kad-dht/pull/422)
* Fixes recursive resolution of dnsaddrs (for bootstrapping).

Introduces hardening proposed in:
https://github.com/ipfs/go-ipfs/issues/4025#issuecomment-342250616

License: MIT
Signed-off-by: Marcin Rataj <lidel@lidel.org>

update documentation for /ipfs -> /p2p multiaddr switch

See: https://github.com/libp2p/libp2p/issues/79

* fixes #6434
* switches the default libp2p multiaddr format to /p2p/Qm...

chore(dep): update a few deps

IPNS over PubSub as an Independent Transport

docs: add information on how to enable experiments

Change Reporter to BandwidthCounter in IpfsNode

update go-datastore

This was failing in CI.

chore: update readme badges to test ci

testing out circleci build triggers with a PR that tidies up the README badges

- remove somewhat redundant `project: ipfs` badge so they fit on 1 line. The link to the website is the url field for the repo.
- Use shields.io "flat square" style for godoc badge to match the others
- Use shields.io for the circleci badge too.
- re-order to be more visually pleasing.

License: MIT
Signed-off-by: Oli Evans <oli@tableflip.io>

Let's get this in so the datastore changes don't block other PRs.

chore(dep): update libp2p

Otherwise, we have port conflicts and other issues.