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Make FD limits configurable by environment property

Fix logging race

Add CircleCI config

Enhance debug logging in dial limiter

dialer: handle dial cancel and/or completion before trying new addresses

avoid spawning goroutines for canceled dials

This may speed up working through our dial queue a bit (bit probably isn't the
main issue).

gx publish 3.0.28

warn when we encounter a useless transport

gx publish 3.0.26

Refactor and relax filtering of known undialable addresses

This commit moves filtering of dial candidates into its own little function.
Things that are being filtered: addresses configured to be blocked,
IPv6 link-local addresses, addresses without a dial-capable transport,
and addresses that we know to be our own. It's is an optimization to
avoid wasting time on dials that we know are going to fail.

This also relaxes the filtering of addresses that we consider our own.
Previously, any address would get filtered that's registered in peerstore
for or own PeerID. For e.g. /ip4/1.2.3.4/tcp/4001 that's fine, but for
ephemeral ports it can already cause problems.

In addition, now that go-libp2p-circuit is being fixed to handle its
multiaddrs slightly differently, /p2p-circuit addresses won't contain
the PeerID anymore. That means they stand for themselves, and would get
filtered too. (/p2p-circuit is the address we want to dial, but it's
also on of "our own addresses").

In the future we'd want to use the mafmt package here, and also consider
/quic, /ws, etc. addresses as our own.

log an error when we have no transports configured