Fixed "recipe_content" path of "check.rake" for 5-2-stable

Created by: ymiyoshi

In Installation Guide

sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlabhq/5-2-stable/lib/support/init.d/gitlab

but in "check.rake" https://github.com/gitlabhq/gitlabhq/blob/5-2-stable/lib/tasks/gitlab/check.rake#L147

  recipe_content = `curl https://raw.github.com/gitlabhq/gitlab-recipes/master/init.d/gitlab 2>/dev/null`

So "bundle exec rake gitlab:check RAILS_ENV=production" check results:

Init script up-to-date? ... no Try fixing it: Redownload the init script For more information see: doc/install/installation.md in section "Install Init Script" Please fix the error above and rerun the checks.

"recipe_content" of "5-2-stable" should be

https://raw.github.com/gitlabhq/gitlabhq/5-2-stable/lib/support/init.d/gitlab

Fixes https://github.com/gitlabhq/gitlabhq/issues/4020