stop using glog

[miekg]

Is this a bug report or a feature request?:

feature request

What happened:

metallb should probably stop using glog (unless it must, because being in google github org?). glog is a badly designed go package and we should stop it spreading even further.

See this bug report: coredns/coredns#1597 and a hilarious twitter thread

• https://twitter.com/peterbourgon/status/972177627996831744

TL;DR: anything else is probably better suited.

[danderson]

LGTM, I have no special attachment to glog, I just used it because it's familiar from work.

Reference to a good structured logging library: https://godoc.org/github.com/go-kit/kit/log