Title: #595: sudo: allow use of default domain suffix
This patch is based on post 1.13 work. The purpose is to allow combination of fully
qualified names and default domain suffix when user log in with a short name.
Similarly to later version, we add #uid value to sudoUser attribute.
To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/595/head:pr595
git checkout pr595