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Skip SetKeepAlivePeriod call on OpenBSD

OpenBSD does not have a user-settable per-socket TCP keepalives. This changes
tryKeepAlive to skip attempting set it when on OpenBSD.

  https://github.com/golang/go/blob/master/src/net/tcpsockopt_openbsd.go#L13-L14

This prevents thousands of `log.Errorf("Failed set keepalive period: %s",
err)`'s from happening.

sync: update CI config files

use log.Warn instead of log.Warning

add bandwidth-related metrics (for Linux and OSX)

expose some Prometheus metrics

enable TCP keepalives

stop using the deprecated go-multiaddr-net package

bump go-reuseport-transprot

fix: don't allow dialing DNS addresses

See https://github.com/libp2p/go-libp2p/issues/841

update deps

Merge pull request #58 from libp2p/dependabot/go_modules/github.com/multiformats/go-multiaddr-net-0.1.3

Bump github.com/multiformats/go-multiaddr-net from 0.1.2 to 0.1.3

Bumps [github.com/multiformats/go-multiaddr-net](https://github.com/multiformats/go-multiaddr-net) from 0.1.2 to 0.1.3.
- [Release notes](https://github.com/multiformats/go-multiaddr-net/releases)
- [Commits](https://github.com/multiformats/go-multiaddr-net/compare/v0.1.2...v0.1.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump github.com/multiformats/go-multiaddr from 0.2.0 to 0.2.1

Bumps [github.com/multiformats/go-multiaddr](https://github.com/multiformats/go-multiaddr) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/multiformats/go-multiaddr/releases)
- [Commits](https://github.com/multiformats/go-multiaddr/compare/v0.2.0...v0.2.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Merge pull request #51 from libp2p/dependabot/go_modules/github.com/multiformats/go-multiaddr-net-0.1.2

Bump github.com/multiformats/go-multiaddr-net from 0.1.1 to 0.1.2