Title: #5523: [Backport][ipa-4-9] Update samba configuration on IPA master to explicitly
use 'server role' setting
This PR was opened automatically because PR #5519 was pushed to master and backport to
ipa-4-9 is required.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/5523/head:pr5523
git checkout pr5523