Allow TTL values when configuring TTLs and time intervals.

Options updated to use ttlvals: max-cache-ttl, max-ncache-ttl,
max-policy-ttl, fstrm-set-reopen-interval, interface-interval, and
min-update-interval.

bin/tests/system/checkconf/bad-interface-interval.conf

@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+options {
+	interface-interval 1x;
+};