4522. [bug] Handle big gaps in log file version numbers better.

[RT #38688]

(cherry picked from commit cab871f1bc)

bin/tests/system/logfileconfig/ns1/named.versconf

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016  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/.
+ */
+
+options {
+	query-source address 10.53.0.1;
+	notify-source 10.53.0.1;
+	transfer-source 10.53.0.1;
+	port 5300;
+	pid-file "named.pid";
+	listen-on port 5300 {
+		10.53.0.1;
+	};
+	listen-on-v6 { none; };
+	recursion no;
+	notify yes;
+};
+
+logging {
+	channel default_log {
+	  buffered no;
+	  file "named_vers" versions 5 size 1000;	// really small size
+	  severity debug 100;
+	  print-time yes;
+	};
+	category default { default_log; default_debug; };
+	category lame-servers { null; };
+
+	channel query_log {
+	  file "query_log";
+	  print-time yes;
+	  buffered yes;
+	};
+	category queries { query_log; };
+};
+
+controls {
+    inet 127.0.0.1 port 9593 allow {
+			 127.0.0.1/32; ::1/128; }
+			 keys { "rndc-key"; };
+};
+
+key "rndc-key" {
+	algorithm hmac-sha256;
+	secret "Am9vCg==";
+};
+
+
+zone "." {
+	type master;
+	file "root.db";
+};