Setup standard FHS 2.3 structure in /var

This was missing from the 1.4 release due to it being hidden in one
of my private plugins. Sorry!

Also, add another log macro. Warnings are quite useful things to have.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

helpers.h

@@ -36,6 +36,7 @@
 }
 
 #define FLOG_DEBUG(fmt, args...)  DO_LOG(LOG_DEBUG, fmt, ##args)
+#define FLOG_WARN(fmt, args...)   DO_LOG(LOG_WARNING, fmt, ##args)
 #define FLOG_ERROR(fmt, args...)  DO_LOG(LOG_CRIT, fmt, ##args)
 #define FLOG_PERROR(fmt, args...) DO_LOG(LOG_CRIT, fmt ". Error %d: %s", ##args, errno, strerror(errno))