Daggerize ExportSnapshotServlet and CheckSnapshotServlet

Eradicate the last remnants of un-injectable servlets!

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=145598002

java/google/registry/dns/DnsModule.java

@@ -76,7 +76,7 @@ public abstract class DnsModule {
   }
 
   @Provides
-  @Parameter("name")
+  @Parameter("domainOrHostName")
   static String provideName(HttpServletRequest req) {
     return extractRequiredParameter(req, "name");
   }