shinken: Add checks for labs puppetmaster

- Make all puppet failure checks a dependency on that,
  to prevent massive notices when there are transient
  puppetmaster failures
- Hardcodes labs puppetmaster info, should probably
  use hiera for this somehow
- Alerts go to labs-infra group, which is me and
  andrewbogott

Change-Id: I208fd3a67c5c3064bfd6fa2757fee2a6d290f07f