Title: #224: responders: do not leak selinux context on clients destruction
The SELinux context created in get_client_cred is not talloc bound and
we were leaking it if available with each client's destruction.
To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/224/head:pr224
git checkout pr224