Add support for Ubuntu 16.04

Till Brehm

2016-04-21 480fefcaac7473ba68c9656e4b03cab949d55d2c

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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"