Fixed #3930 usage of split in letsencrypt cron module.

Till Brehm

2016-05-26 0af38c471a32ede3d267742d7652bcd8b9acbe9d

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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"