We don't maintain a long standing log file for the helper process, so
any log messages that we issue from inside it just vanish after router
cleanup.
This patch enforces syslog logging for the daemon, revealing any errors
and other messages that may be triggered by it.
Closes-Bug: #1635629
Change-Id: I8712f5f3a34fc9f403dfba06e7a64bd9eb408c4a