Convert logging from syslog to stdout
Convention at the WMF seems to be evolving toward writing logs to
stdout. Output will be sent to syslog either via k8s, or via journald
(by way of systemd).
- Logger writes to an io.Writer (os.Stdout)
- Timestamp and logging level has been added to each structured message.
- The "@cee" cookie has been dropped for the time-being