Backport fixes for rhbz#961278, rhbz#961278 and rhbz#961251
    
    - Resolves: rhbz#961357 - Missing dyndns_update entry in sssd.conf during
                              realm join
    - Resolves: rhbz#961278 - Login failure: Enterprise Principal enabled by
                              default for AD Provider
    - Resolves: rhbz#961251 - sssd does not create user's krb5 ccache dir/file
                              parent directory when logging in