Further fixes on website stats tab.

Till Brehm

2016-01-02 97dafdc41dc9cf8cea4eb71a5566238d9e303471

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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"