Merge branch 'stable-3.1'

Marius Burkard

2016-01-20 337473b29af23892d2bcbe4cc97c087aa5ff8b30

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check process hhvm_{SYSTEM_USER} with pidfile /var/run/hhvm/hhvm_{SYSTEM_USER}.pid 
   start program = "/etc/init.d/hhvm_{SYSTEM_USER} restart" 
   stop  program = "/etc/init.d/hhvm_{SYSTEM_USER} stop"