Test: switch to using OpenLDAP url for connect timeout

After the switch from elasticsearch.com to elastic.co, these tests started failing
due to socket connect errors. Now we will just connect to the OpenLDAP server
which should be a different machines than the ones running tests.

Original commit: elastic/x-pack-elasticsearch@7bf713a313

src/test/java/org/elasticsearch/shield/authc/ldap/LdapSessionFactoryTests.java

@@ -57,7 +57,7 @@ public class LdapSessionFactoryTests extends LdapTest {
     @Network
     public void testConnectTimeout() {
         // Local sockets connect too fast...
-        String ldapUrl = "ldap://elasticsearch.com:389";
+        String ldapUrl = "ldap://54.200.235.244:389";
         String groupSearchBase = "o=sevenSeas";
         String[] userTemplates = new String[] {
                 "cn={0},ou=people,o=sevenSeas",