Fix nomulus GetEppResourceCommand (#1865)

* Fix nomulus GetEppResourceCommand

Fixes a bug in read_timestamp validation.

Fixes string representation of Collection fields in Epp Resources.

core/src/main/java/google/registry/model/ImmutableObject.java

@@ -14,6 +14,7 @@
 
 package google.registry.model;
 
+import static com.google.common.collect.Iterables.transform;
 import static com.google.common.collect.Maps.transformValues;
 import static java.lang.annotation.ElementType.FIELD;
 import static java.lang.annotation.RetentionPolicy.RUNTIME;
@@ -178,7 +179,7 @@ public abstract class ImmutableObject implements Cloneable {
       return transformValues((Map<?, ?>) value, ImmutableObject::hydrate);
     }
     if (value instanceof Collection) {
-      return ((Collection<?>) value).stream().map(ImmutableObject::hydrate);
+      return transform((Collection<?>) value, ImmutableObject::hydrate);
     }
     if (value instanceof ImmutableObject) {
       return ((ImmutableObject) value).toHydratedString();

core/src/main/java/google/registry/tools/GetEppResourceCommand.java

@@ -60,11 +60,11 @@ abstract class GetEppResourceCommand implements CommandWithRemoteApi {
 
   @Override
   public void run() {
+    DateTime now = clock.nowUtc();
     if (readTimestamp == null) {
-      readTimestamp = clock.nowUtc();
+      readTimestamp = now;
     }
-    checkArgument(
-        !readTimestamp.isBefore(clock.nowUtc()), "--read_timestamp may not be in the past");
+    checkArgument(!readTimestamp.isBefore(now), "--read_timestamp may not be in the past");
     runAndPrint();
   }
 }