[WFCORE-195] Outbound LDAP connection in domain mode test case

We already have these classes in WFCORE, although not in a location that makes them reusable:

https://github.com/wildfly/wildfly-core/tree/master/domain-management/src/test/java/org/jboss/as/domain/management/security/realms

Can you guys looks into get this into the upstream project so we can get rid of the need for multiple copies?

In seeming contradiction to the above, I would prefer having this particular copy in testsuite-core/domain over testsuite-core/shared. The testsuite-core/shared artifact is somewhat public API, as downstream projects may use it to help with their testsuites. WildFly full does, and other projects that base on core may as well. We've already had major hassles from changes in this module breaking downstream testsuites. If someone is going to expose this stuff as a public API, I'd prefer that it's Apache, not us.