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* better name for timer
* cancel context from within stop

Co-authored-by: Adin Schmahmann <adin.schmahmann@gmail.com>

Co-authored-by: Will <will.scott@protocol.ai>

MVP for #6097

This feature will repeatedly reconnect (with a randomized exponential backoff)
to peers in a set of "peered" peers.

In the future, this should be extended to:

1. Include a CLI for modifying this list at runtime.
2. Include additional options for peers we want to _protect_ but not connect to.
3. Allow configuring timeouts, backoff, etc.
4. Allow groups? Possibly through textile threads.
5. Allow for runtime-only peering rules.
6. Different reconnect policies.

But this MVP should be a significant step forward.

Include the git blob id of the dir-index bundle in the ETag

feat: bootstrap in dht when the routing table is empty

While the content of raw files retrieved via the gateway should never
change, the look and feel of the directory index can and will change
between versions of go-ipfs.

Incorporate the hash of assets/bindata.go into the ETag when appropriate

Otherwise, we could end up with only DHT clients and never re-bootstrap.

I've left the default go-ipfs bootstrapping code in for now as it's technically
possible to disable the DHT entirely.

quic: remove experimental status and add it to the default config

Fixes init output.

But only if private networks are disabled.

Signature verification is now always strict.

chore: update libp2p deps

* Update swarm to prefer QUIC addrs over other addrs.
* Update yamux to increase throughput.

fix: support directory listings even if a 404 page is present

fixes https://github.com/ipfs/go-ipfs/pull/4233#issuecomment-631454543

Basically, there's a trade-off here:

1. We can support directory listings while supporting 404 pages (this PR).
2. If a 404 page is present, directory listings don't work.

Given that option 1 is more flexible and users shouldn't be _too_ confused if
they land on a directory with no index.html page, I've gone with that option.

doc(plugin): document plugin config

test(sharness): fix fuse tests

chore: update deps

And remove use of mafilter library (now rolled into go-multiaddr).

chore: update libp2p

docs: update experimental-features doc with IPNS over pubsub changes.

docs: cleanup config formatting

fix(gateway): ensure directory listings have Content-Type text/html

Files already have an explicit Content-Type set. Be sure to do this for
directory listings as well to avoid a fallback to autodetection in
net/http. That fallback fails when a ResponseWriter is installed that
performs compression.

Report a consistent status code for HEAD requests that end up in a
redirect.

test(sharness): test the local symlink

misc config/experimental-features doc fixes