minor additions

[debian/control]
- python-statsd as a build dependencies so we can test statsd is working
  during package building.
- depends on package `adduser` which is used in postinst. Fix lintian
  check: maintainer-script-needs-depends-on-adduser

[debian/copyright]
- Timo nickname is "Krinkle"
- Mention Antoine and Wikimedia in the copyright list for debian/*

[debian/watch]
- updated regex, we want to be as precise as possible so escape dots and
  use \d when looking for numbers.

Lintian fixes:
* binary-without-manpage usr/bin/zuul-server
  Fixed by filling debian/zuul.manpages