Add check_mk sensor for gums-crit.fnal.gov web (results of the gen-pwd script!)
This is a follow-up from CHG000000009852.
The sensor should verify that
1. The localhost webpage is up
2. The webpage via the alias is up (gums-crit.fnal.gov)
3. The files were updated recently. If updated over 1h ago -> WARNING. If updated over 3h ago -> CRITICAL
The sensor should publish the latency to get the webpage (whichever you need to verify point 3) as performance data.