If LogFilenames are specified in a relative path then they are placed
under ${LOGDIR}. If those names start with "./" then they are placed
under ${WORKDIR}.
The patterns ${PROTO} and ${PORT} will be substituted with the
protocol name and the port number of this DeleGate respectively.
These files and directories will be created automatically by
DeleGate if possible. You can stop logging by specifying null
file name like LOGFILE="" or PROTOLOG="".