Title: #5299: [Backport][ipa-4-8] ipatests: support subordinate upn suffixes
This PR was opened automatically because PR #5254 was pushed to master and backport to
ipa-4-8 is required.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/5299/head:pr5299
git checkout pr5299