Fix import

Author: mark-vieira

x-pack/plugin/security/src/internalClusterTest/java/org/elasticsearch/xpack/security/authc/pki/PkiAuthDelegationIntegTests.java

@@ -7,7 +7,7 @@
 
 package org.elasticsearch.xpack.security.authc.pki;
 
-import org.apache.lucene.tests.util.LuceneTestCase;
+import org.apache.lucene.util.LuceneTestCase;
 import org.elasticsearch.ElasticsearchStatusException;
 import org.elasticsearch.client.RequestOptions;
 import org.elasticsearch.client.RestHighLevelClient;