plugins: reduce log level LOG_ERR -> LOG_WARNING

These plugins signal success and failure directly to the console, the
user should inspect syslog for more information.

This change is a follow-up to 340cae4, where kernel logs of LOG_ERR and
higher are allowed to log directly to the console.  Since syslogd has
not been started before these plugins, the log messages would otherwise
leak to the console.

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

plugins/urandom.c

@@ -154,7 +154,7 @@ static void setup(void *arg)
 	close(fd);
 	free(rpi);
 	if (rc < 0)
-		logit(LOG_ERR, "Failed adding entropy to kernel random pool: %s", strerror(err));
+		logit(LOG_WARNING, "Failed adding entropy to kernel random pool: %s", strerror(err));
 	print_result(rc < 0);
 	return;
 fallback: