Merge branch 'stable-3.1'

Marius Burkard

2016-04-26 5152e9a75e6e0ed4dc26358e4e608ce684147b32

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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"