Improve error messages related to EAP DB

Add SQLite error message and DB name to the DB related errors. Add
enough tracing so that users can know exactly where users are failing to
be found.

Signed-off-by: Ben Greear <greearb@candelatech.com>

src/radius/radius_server.c

@@ -2035,6 +2035,12 @@ static int radius_server_get_eap_user(void *ctx, const u8 *identity,
 		sess->remediation = user->remediation;
 		sess->macacl = user->macacl;
 	}
+
+	if (ret) {
+		RADIUS_DEBUG("%s: User-Name not found from user database",
+			     __func__);
+	}
+
 	return ret;
 }