Make Registry.get(tld) hit memcache explicitly.

TESTED=The test fails if you change line 134 in Ofy to not use memcache
    and use the unchanged original Registry.get() code. This is the
    expected behavior.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=154226534

java/google/registry/model/registry/Registry.java

@@ -250,7 +250,7 @@ public class Registry extends ImmutableObject implements Buildable {
                     @Override
                     public Registry run() {
                       return ofy()
-                          .load()
+                          .loadWithMemcache()
                           .key(Key.create(getCrossTldKey(), Registry.class, tld))
                           .now();
                     }}));