metaconfig/named: fix validation of logging channels in categories

Fixes #1784

Author: jouvin

ncm-metaconfig/src/main/metaconfig/named/pan/schema.pan

@@ -96,7 +96,7 @@ type named_zone = {
 };
 
 type named_channel_name = string with
-    exists ("/software/components/metaconfig/services/{/etc/named.conf}/contents/logging/" + SELF) ||
+    exists ("/software/components/metaconfig/services/{/etc/named.conf}/contents/logging/channels/" + SELF) ||
     error (SELF + " doesn't refer to a logging channel");
 
 @{

ncm-metaconfig/src/main/metaconfig/named/tests/profiles/config.pan

@@ -7,7 +7,9 @@ prefix "/software/components/metaconfig/services/{/etc/named.conf}/contents";
 "logging/channels/default_debug" = dict (
     "severity", "dynamic",
     "file", "data/named.run");
-"logging/category" = dict();
+"logging/category" = dict(
+    "queries", list("default_debug"),
+);
 "includes" = append("/etc/named.rfc1912.zones");
 "includes" = append("/etc/another.conf");