Fix for issue #222 1.7.2 logging path

[marcoamorales]

Minecraft now logs to a different path, with the old path this would create a lot of tail processes.

[ghost]

Unfortunately the fix would break pre-1.7.2 servers... It needs some logic in init/msm to detect the default log path, something along the lines of (pseudocode):

if [ -n "${DEFAULT_LOG_PATH}" ]; then
    # This method would require msm.conf no longer having a default entry for DEFAULT_LOG_PATH,
    # but allows user to specify one
    SERVER_LOG_PATH=${LOG_PATH}
elif [ -f [...]/logs/latest.log ]; then
    # Otherwise we detect and use >=1.7.2 log path
    SERVER_LOG_PATH=logs/latest.log
elif [ -f [...]/server.log ]; then
    # Or finally pre-1.7.2 log path
    SERVER_LOG_PATH=server.log
else
    # Throw error, user needs to specify their own DEFAULT_LOG_PATH value in msm.conf
fi

Of course it needs to be a bit more robust than this... For example, it doesn't really cater for different servers having different log paths!