Default (if not specified) -w work -o out.

-o <out_dir> is only used by 'iso' command.

Adjust build.sh of releng and baseline profile to reflect this change.

<project>
  - work <- $work_dir
  - out  <- $out_dir

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>