Allow domain specific welcom messages:

Daniel Steglich

2016-01-15 bb984cedaa3530ccc88c4c1f7ca84ebbfbc52d89

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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"