Use -dot- subdomain notation in MapReduce console links

appspot.com is not provisioned with a multi-level wildcard SSL certificate, so
URLs of the form https://service.projectid.appspot.com/path need to be rewritten
as https://service-dot-projectid.appspot.com/path (and same for version names).

This is a follow-up to []

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=231418795

javatests/google/registry/export/ExportDomainListsActionTest.java

@@ -94,7 +94,8 @@ public class ExportDomainListsActionTest extends MapreduceTestCase<ExportDomainL
     runMapreduce();
     assertThat(response.getPayload())
         .startsWith(
-            "Mapreduce console: https://backend.hostname.tld/_ah/pipeline/status.html?root=");
+            "Mapreduce console: https://backend-dot-projectid.appspot.com"
+                + "/_ah/pipeline/status.html?root=");
   }
 
   @Test