puppetize wikitech robots.txt

RT #6689 - 'cleanup wikitech's robot.txt'

(there was discussion on ticket how to do it for context)

- do not have manual deploys of this file

- puppetize it in openstack-manager right next to the Apache site
  for wikitech/labs

- have a way to actually test changes in robots.txt on labs
  (versus using production PHP files)

- we also puppetize this for other stuff like gitblit/doc/misc services

- i personally think it's the easier fix to stop manual syncs,
  and even has real advantages over implementing the PHP file from prod
  because it gives the freedom to have different rules for labs/prod
  which i could well imagine we might also want (to test and other)

Change-Id: I63f669c0f56098a7edc2d8c03ad853ff0eaa4b3c