Remove the ofy().load() inside of HostResource.cloneProjectedAtTime

In fact, completely eviscerate cloneProjectedAtTime (to be removed in
a followup CL) in favor of doing the projection of transfers and the
loading of values from the superordinate domain at call sites. This
is one of the issues that blocked the memcache audit work, since the
load inside of cloneProjectedAtTime could not be controlled by the
caller.

Note: fixed a minor bug where a subordinate host created after its superordinate domain was last transferred should have lastTransferTime==null but was previously reporting the domain's lastTransferTime.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=149769125

java/google/registry/flows/host/HostDeleteFlow.java

@@ -33,6 +33,7 @@ import google.registry.flows.FlowModule.Superuser;
 import google.registry.flows.FlowModule.TargetId;
 import google.registry.flows.TransactionalFlow;
 import google.registry.flows.async.AsyncFlowEnqueuer;
+import google.registry.model.EppResource;
 import google.registry.model.domain.DomainBase;
 import google.registry.model.domain.metadata.MetadataExtension;
 import google.registry.model.eppcommon.StatusValue;
@@ -93,7 +94,14 @@ public final class HostDeleteFlow implements TransactionalFlow {
     HostResource existingHost = loadAndVerifyExistence(HostResource.class, targetId, now);
     verifyNoDisallowedStatuses(existingHost, DISALLOWED_STATUSES);
     if (!isSuperuser) {
-      verifyResourceOwnership(clientId, existingHost);
+      // Hosts transfer with their superordinate domains, so for hosts with a superordinate domain,
+      // the client id, needs to be read off of it.
+      EppResource owningResource =
+          existingHost.isSubordinate()
+              ? ofy().load().key(existingHost.getSuperordinateDomain()).now()
+                  .cloneProjectedAtTime(now)
+              : existingHost;
+      verifyResourceOwnership(clientId, owningResource);
     }
     asyncFlowEnqueuer.enqueueAsyncDelete(existingHost, clientId, isSuperuser);
     HostResource newHost =