audio/murmur: Fix for clean installs

Config file in 1.3.0 does not specify logfile location and attempts to
write murmur.log to $PWD. Specify path for log and pidfile by patching
sample config file.

Also support reloading service via SIGUSR1 so TLS cert/key updates can
be deployed without restarting server.

MFH: 2019Q4