frecon: dbus: Move "normal" error messages to DEBUG

It is normal for dbus initialization to take a number of attempts
to connect, so let's not print those messages by default.

We will still get an error if DBUS initialization times out in
dbus_init_wait.

BUG=b:183336123
TEST=emerge-asurada -v frecon && cros deploy dut9999 frecon
     dmesg | grep frecon => less messages

Change-Id: Ic2cb6d67c6721a7ea69037ce5547b1b45580095d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/frecon/+/2777713
Reviewed-by: Dominik Behr <dbehr@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Commit-Queue: Nicolas Boichat <drinkcat@chromium.org>
diff --git a/dbus_full.c b/dbus_full.c
index d2a89d9..9028ae2 100644
--- a/dbus_full.c
+++ b/dbus_full.c
@@ -133,7 +133,7 @@
 	new_dbus->conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
 	if (dbus_error_is_set(&err)) {
 		if (!dbus_connect_fail) {
-			LOG(ERROR, "Cannot get DBUS connection");
+			LOG(DEBUG, "Cannot get DBUS connection");
 			dbus_connect_fail = true;
 			dbus_connect_fail_time = get_monotonic_time_ms();
 		}
@@ -143,7 +143,7 @@
 
 	if (dbus_connect_fail) {
 		int64_t t = get_monotonic_time_ms() - dbus_connect_fail_time;
-		LOG(INFO, "DBUS connected after %.1f seconds", (float)t / 1000.0f);
+		LOG(DEBUG, "DBUS connected after %.1f seconds", (float)t / 1000.0f);
 	}
 
 	result = dbus_bus_request_name(new_dbus->conn, kFreconDbusInterface,