Title: #856: pam_sss: Add missing colon to the PIN prompt
This can be noticed in the sudo prompt, when the system is configured
to authenticate users using smart cards.
Resolves: Pagure#4049 
To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/856/head:pr856
git checkout pr856