Merge branch 'patch-1' into 'stable-3.1'

Marius Burkard

2016-05-03 f43994cca340165770db223e116fd81e9ab7b429

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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"