Record a version of EPP metrics with TLD for domain commands

Also fixes the issue that dry run EPP commands were incorrectly being
reported on.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171062984

java/google/registry/model/eppinput/EppInput.java

@@ -111,6 +111,11 @@ public class EppInput extends ImmutableObject {
     return Optional.absent();
   }
 
+  /** Returns whether this EppInput represents a command that operates on domain resources. */
+  public boolean isDomainResourceType() {
+    return getResourceType().or("").equals("domain");
+  }
+
   @Nullable
   private ResourceCommand getResourceCommand() {
     InnerCommand innerCommand = commandWrapper.getCommand();