Fixed postconf warnings in installer.

Till Brehm

2016-01-02 f652c5901e8230fd53bcd5f57ccd6ae69dc2b2ca

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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"