[SSSD] [sssd PR#1020][opened] Move code and issues tracker to Github

[pbrezina]

   URL: https://github.com/SSSD/sssd/pull/1020
Author: pbrezina
 Title: #1020: Move code and issues tracker to Github
Action: opened

PR body:
"""
This changes readme.

I have opened issues tracker on Github. Unfortunately, issues can still be created
on Pagure because there is only option to make issues 'read only' which will
disable
'new issue' button but we won't be able to add comments to existing issues.

I will move releases to Github during next week.
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/1020/head:pr1020
git checkout pr1020