SEC-951: Acl Serialization Errors that cohere with parent-child-structure of Acls. Modified tests to reproduce the issue and applied suggested fix (recursive call to set transient fields on parent).

acl/src/main/java/org/springframework/security/acls/jdbc/EhCacheBasedAclCache.java

@@ -135,6 +135,10 @@ public class EhCacheBasedAclCache implements AclCache {
             FieldUtils.setProtectedFieldValue("aclAuthorizationStrategy", value, this.aclAuthorizationStrategy);
             FieldUtils.setProtectedFieldValue("auditLogger", value, this.auditLogger);
         }
+
+        if (value.getParentAcl() != null) {
+            initializeTransientFields((MutableAcl) value.getParentAcl());
+        }
         return value;
     }