SPEC: Fix unowned directory
https://fedoraproject.org/wiki/Packaging:UnownedDirectories
sh$ rpm -qf /usr/lib64/sssd/conf/ /usr/lib64/sssd/conf/sssd.conf
file /usr/lib64/sssd/conf is not owned by any package
sssd-common-1.15.3-2.fc27.x86_64
Reviewed-by: Pavel Březina <pbrezina@redhat.com>