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Add the health_check gem end expose the health_check route
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/7887
This adds a health_check controller on /health_check (.html, .json ,.xml)
and health_check/checktype (.html, .json, .xml) for example health_check/cache.json
By default it checks the database, and cache.
The endpoint is only accessible if you pass a valid health check access token. A new page in the admin section titled Heath Check has been added in order to show the current token and allow you to reset it.