- Hold list of pubkeys instead of a single pubkey in zones.

- Change dns_zone_copy to use pubkey list.
- MAGIC-number related fixes and miscellaneous defensive programing issues.

bin/tests/named.conf

@@ -234,6 +234,8 @@ zone "stub.demo.zone" {
 	allow-transfer { any; };
 	allow-query { any; };
 	max-transfer-time-in 120;	// if not set, global option is used.
+	pubkey 257 255 1 "a useless key";
+	pubkey 257 255 1 "another useless key";
 };
 
 zone "." {
@@ -261,6 +263,7 @@ zone "non-default-acl.demo.zone" {
 		1.2.3.4;
 		5.6.7.8;
 	};
+	pubkey 666 665 664 "key of the beast";
 };
 
 key sample_key {			// for TSIG; supported by parser

bin/tests/nconf_test.c

@@ -81,7 +81,7 @@ int main (int argc, char **argv) {
 	isc_mem_t *mem = NULL;
 	dns_c_cbks_t callbacks;
 
-#if 0
+#if 1
 	callbacks.zonecbk = NULL;
 	callbacks.zonecbkuap = NULL;
 	callbacks.optscbk = NULL;