Add nameserver limit checks.

bin/tests/system/limits/ns1/named.conf

@@ -0,0 +1,20 @@
+options {
+	query-source address 10.53.0.1;
+	port 5300;
+	directory ".";
+	pid-file "named.pid";
+	listen-on { 10.53.0.1; };
+	listen-on-v6 {none;};
+	recursion no;
+	notify yes;
+};
+
+zone "." {
+	type master;
+	file "root.db";
+};
+
+zone "example" {
+	type master;
+	file "example.db";
+};

bin/tests/system/limits/ns1/root.db

@@ -0,0 +1,13 @@
+$TTL 300
+. 			IN SOA	gson.nominum.com. a.root.servers.nil. (
+				2000042100   	; serial
+				600         	; refresh
+				600         	; retry 
+				1200    	; expire
+				600       	; minimum
+				)
+.			NS	a.root-servers.nil.
+a.root-servers.nil.	A	10.53.0.1
+
+example.		NS	ns1.example.
+ns1.example.		A	10.53.0.1