test: update active directory certificate

This change removes the old active directory certificate and replaces it with the AD
CA certificate that is valid until 2029 instead of needing to be changed yearly.

Closes elastic/elasticsearch#2440

Original commit: elastic/x-pack-elasticsearch@2f05bdfd01

elasticsearch/x-pack/shield/src/test/java/org/elasticsearch/shield/authc/activedirectory/ActiveDirectoryGroupsResolverTests.java

@@ -6,7 +6,6 @@
 package org.elasticsearch.shield.authc.activedirectory;
 
 import com.unboundid.ldap.sdk.Filter;
-import org.apache.lucene.util.LuceneTestCase;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.shield.authc.ldap.GroupsResolverTestCase;
@@ -23,7 +22,6 @@ import static org.hamcrest.Matchers.hasItem;
 import static org.hamcrest.Matchers.is;
 
 @Network
-@LuceneTestCase.AwaitsFix(bugUrl = "https://github.com/elastic/x-plugins/issues/2440")
 public class ActiveDirectoryGroupsResolverTests extends GroupsResolverTestCase {
 
     public static final String BRUCE_BANNER_DN = "cn=Bruce Banner,CN=Users,DC=ad,DC=test,DC=elasticsearch,DC=com";

elasticsearch/x-pack/shield/src/test/java/org/elasticsearch/test/ShieldSettingsSource.java

@@ -217,7 +217,7 @@ public class ShieldSettingsSource extends ClusterDiscoveryConfiguration.UnicastZ
             return getSSLSettingsForPEMFiles("/org/elasticsearch/shield/transport/ssl/certs/simple/testnode.pem", "testnode",
                     Collections.singletonList("/org/elasticsearch/shield/transport/ssl/certs/simple/testnode.crt"),
                     Arrays.asList("/org/elasticsearch/shield/transport/ssl/certs/simple/testnode-client-profile.crt",
-                            "/org/elasticsearch/shield/transport/ssl/certs/simple/activedir.crt",
+                            "/org/elasticsearch/shield/transport/ssl/certs/simple/active-directory-ca.crt",
                             "/org/elasticsearch/shield/transport/ssl/certs/simple/testclient.crt",
                             "/org/elasticsearch/shield/transport/ssl/certs/simple/openldap.crt",
                             "/org/elasticsearch/shield/transport/ssl/certs/simple/testnode.crt"),