Title: #3259: [WIP] Test AD topology
This PR shows how the new topology enables test cases that require Active Directory
The name of the topology is `ad`, however, it also includes a `master` host.
The changes made to `test_trust.py` were made to remove `ad_subdomain` and `ad_treedomain`
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/3259/head:pr3259
git checkout pr3259