Merge branch 'xfs-quota' into 'stable-3.1'

Till Brehm

2016-04-24 bc6917486cdf177db87d9d6d1a2fad57bed17ce3

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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"