core: add Zone in request.Request
Add a Zone field in request.Request and a dnsutil.Trimzone help
function.
@@ -16,6 +16,9 @@ type Request struct {
Req *dns.Msg
W dns.ResponseWriter
+ // Optional lowercased zone of this query.
+ Zone string
+
// Cache size after first call to Size or Do.
size int
do int // 0: not, 1: true: 2: false
