move logging code to its own file

log.h

@@ -0,0 +1,10 @@
+#ifndef LOG_H
+#define LOG_H
+
+void setup_syslog(const char* bin_name);
+
+void log_message(int type, const char* msg, ...);
+
+void log_connection(struct connection_desc* desc, const struct connection *cnx);
+
+#endif /* LOG_H */