Allow FANCYTTY to be sourced from /etc/default/rcS.

Allow FANCYTTY to be sourced from /etc/default/rcS.

The FANCYTTY shell variable is sourced from /etc/default/rcS before
etc/lsb-base-logging.sh .

- Systems with an administrator-provided /etc/lsb-base-logging.sh keep
  working.
- Systems without /etc/lsb-base-logging.sh can now override FANCYTTY in
  /etc/default/rcS too.

Thanks-To: Roger Leigh <rleigh@codelibre.net>
Reported-by: Stanislav Maslovski <stanislav.maslovski@gmail.com>
Closes: #673207
Git-Dch: Full