Add dagger map for injecting DnsWriter implementations

This is one of several CLs in a sequence for allowing per-TLD DNS
implementations.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129445641

java/google/registry/dns/writer/VoidDnsWriter.java

@@ -1,49 +0,0 @@
-// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package google.registry.dns.writer;
-
-import com.google.common.base.Joiner;
-import google.registry.model.dns.DnsWriter;
-import java.util.HashSet;
-import java.util.Set;
-import java.util.logging.Logger;
-
-/**
- * {@link DnsWriter} that doesn't actually update records in a DNS server.
- *
- * <p>All this class does is write its displeasure to the logs.
- */
-public final class VoidDnsWriter implements DnsWriter {
-
-  private static final Logger logger = Logger.getLogger(VoidDnsWriter.class.getName());
-
-  private final Set<String> names = new HashSet<>();
-
-  @Override
-  public void publishDomain(String domainName) {
-    names.add(domainName);
-  }
-
-  @Override
-  public void publishHost(String hostName) {
-    names.add(hostName);
-  }
-
-  @Override
-  public void close() {
-    logger.warning("Ignoring DNS zone updates! No DnsWriterFactory implementation specified!\n"
-        + Joiner.on('\n').join(names));
-  }
-}