conf, util, tap: Implement --trace option for extra verbose logging

--debug can be a bit too noisy, especially as single packets or
socket messages are logged: implement a new option, --trace,
implying --debug, that enables all debug messages.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

util.c

@@ -45,6 +45,7 @@ static int	log_sock = -1;
 static char	log_ident[BUFSIZ];
 static int	log_opt;
 static time_t	log_debug_start;
+int		log_trace;
 
 #define logfn(name, level)						\
 void name(const char *format, ...) {					\
@@ -77,6 +78,11 @@ logfn(warn,  LOG_WARNING)
 logfn(info,  LOG_INFO)
 logfn(debug, LOG_DEBUG)
 
+void trace_init(int enable)
+{
+	log_trace = enable;
+}
+
 /**
  * __openlog() - Non-optional openlog() wrapper, to allow custom vsyslog()
  * @ident:	openlog() identity (program name)