clientv3: importing github.com/coreos/etcd/transport hijacks default logger

[davecheney]

What happened:

importing github.com/coreos/etcd/transport caused capnslog to hijack my logger, (stdlib log package)

What did you expect:

importing github.com/coreos/etcd/transport would not hijack my logger.

Discussion:

Following the WithTLS example here

https://godoc.org/github.com/coreos/etcd/clientv3#ex-Config--WithTLS

requires the github.com/coreos/etcd/pkg/transport package, which has a transitive dependency on github.com/coreos/etcd/pkg/fileutils which itself has a transitive dependency on github.com/coreos/pkg/capnslog. capnslog has an init function which hijacks the default router.

[davecheney]

Caused by 4a0f922