Merge branch 'stable-3.1'

Marius Burkard

2016-03-23 f964bf7e7403578e787ce5519d9e63c074967242

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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"