Create *InfoData objects instead of reusing *Resource objects

This is probably best from a code-cleanliness perspective anyways,
but the rationale is that tightly coupling the resources to the
info responses was a straightjacket that required all status
values and fields to be directly available on the resource. With
this change, I already was able to get rid of the preMarshal()
hackery, and I will be able to get rid of cloneWithLinkedStatus()
and most of the contents of cloneProjectedAtTime() for non-domains.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=144252924

javatests/google/registry/testing/DatastoreHelper.java

@@ -112,6 +112,7 @@ public class DatastoreHelper {
   public static HostResource newHostResource(String hostName) {
     return new HostResource.Builder()
         .setFullyQualifiedHostName(hostName)
+        .setCreationClientId("TheRegistrar")
         .setCurrentSponsorClientId("TheRegistrar")
         .setCreationTimeForTest(START_OF_TIME)
         .setRepoId(generateNewContactHostRoid())
@@ -218,6 +219,7 @@ public class DatastoreHelper {
     return new ContactResource.Builder()
         .setRepoId(repoId)
         .setContactId(contactId)
+        .setCreationClientId("TheRegistrar")
         .setCurrentSponsorClientId("TheRegistrar")
         .setAuthInfo(ContactAuthInfo.create(PasswordAuth.create("2fooBAR")))
         .setCreationTimeForTest(START_OF_TIME)