Partially revert "CONFIG: Use default config when none provided"
    
    This reverts part of commit 59744cff6edb106ae799b2321cb8731edadf409a.
    
    Removed is copying of default configuration into /etc/sssd/sssd.conf
    Sample configurations is still part of installation.
    
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
    (cherry picked from commit c029f707d4847b01ff64bf3bb1fd46c0b5927cdb)