Replace loadByUniqueId() with methods that don't overload unique id

It is replaced by loadByForeignKey(), which does the same thing that
loadByUniqueId() did for contacts, hosts, and domains, and also
loadDomainApplication(), which loads domain application by ROID. This eliminates
the ugly mode-switching of attemping to load by other foreign key or ROID.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=133980156

java/google/registry/tools/GetEppResourceCommand.java

@@ -15,13 +15,15 @@
 package google.registry.tools;
 
 import static com.google.common.base.Preconditions.checkArgument;
-import static google.registry.model.EppResourceUtils.loadByUniqueId;
+import static google.registry.model.EppResourceUtils.loadByForeignKey;
+import static google.registry.model.EppResourceUtils.loadDomainApplication;
 import static org.joda.time.DateTimeZone.UTC;
 
 import com.beust.jcommander.Parameter;
 import com.beust.jcommander.Parameters;
 import com.googlecode.objectify.Key;
 import google.registry.model.EppResource;
+import google.registry.model.domain.DomainApplication;
 import google.registry.tools.Command.RemoteApiCommand;
 import google.registry.util.TypeUtils.TypeInstantiator;
 import org.joda.time.DateTime;
@@ -32,8 +34,7 @@ import org.joda.time.DateTime;
  * @param <R> {@link EppResource} subclass.
  */
 @Parameters(separators = " =")
-abstract class GetEppResourceCommand<R extends EppResource>
-    implements RemoteApiCommand {
+abstract class GetEppResourceCommand<R extends EppResource> implements RemoteApiCommand {
 
   private final DateTime now = DateTime.now(UTC);
 
@@ -52,14 +53,17 @@ abstract class GetEppResourceCommand<R extends EppResource>
   /** Resolve any parameters into ids for loadResource. */
   abstract void processParameters();
 
-  /** 
+  /**
    * Load a resource by ID and output. Append the websafe key to the output for use in e.g.
    * manual mapreduce calls.
    */
   void printResource(String uniqueId) {
-    R resource = loadByUniqueId(clazz, uniqueId, readTimestamp);
+    EppResource resource =
+        (clazz == DomainApplication.class)
+            ? loadDomainApplication(uniqueId, readTimestamp)
+            : loadByForeignKey(clazz, uniqueId, readTimestamp);
     System.out.println(resource != null
-        ? String.format("%s\n\nWebsafe key: %s", 
+        ? String.format("%s\n\nWebsafe key: %s",
             expand ? resource.toHydratedString() : resource,
             Key.create(resource).getString())
         : String.format(