Merge branch 'master' into 'stable-3.1'

Till Brehm

2016-06-17 522bede75fce4a0e3a7d2c7eff1eee198b900a22

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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"