Fix setting openldap realm ssl config

This change fixes the setup of the SSL configuration for the test
openldap realm. The configuration was missing the realm identifier so
the SSL settings being used were just the default JDK ones that do not
trust the certificate of the idp fixture.

See #37591

Author: jaymode

x-pack/qa/openldap-tests/src/test/java/org/elasticsearch/xpack/security/authc/ldap/OpenLdapUserSearchSessionFactoryTests.java

@@ -51,7 +51,7 @@ public class OpenLdapUserSearchSessionFactoryTests extends ESTestCase {
     private static final String LDAPCACERT_PATH = "/ca.crt";
 
     @Before
-    public void init() throws Exception {
+    public void init() {
         Path caPath = getDataPath(LDAPCACERT_PATH);
         /*
          * Prior to each test we reinitialize the socket factory with a new SSLService so that we get a new SSLContext.
@@ -60,7 +60,7 @@ public void init() throws Exception {
          */
         globalSettings = Settings.builder()
             .put("path.home", createTempDir())
-            .put("xpack.security.authc.realms.ldap.ssl.certificate_authorities", caPath)
+            .put("xpack.security.authc.realms.ldap.oldap-test.ssl.certificate_authorities", caPath)
             .build();
         threadPool = new TestThreadPool("LdapUserSearchSessionFactoryTests");
     }