Pull request: all: allow local non-top-level domains

Updates #2961.

Squashed commit of the following:

commit 207eeb85caf6caee81a669302daf4e10a5b61585
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Apr 15 18:48:50 2021 +0300

    all: allow local non-top-level domains

internal/dnsforward/dns.go

@@ -264,7 +264,7 @@ func (s *Server) processInternalHosts(dctx *dnsContext) (rc resultCode) {
 	}
 
 	reqHost := strings.ToLower(q.Name)
-	host := strings.TrimSuffix(reqHost, s.autohostSuffix)
+	host := strings.TrimSuffix(reqHost, s.localDomainSuffix)
 	if host == reqHost {
 		return resultCodeSuccess
 	}