debian.conf: change the default value of IMAGE_FSTYPES
debian.conf: change the default value of IMAGE_FSTYPES

Changed to "ext3 tar.gz", which are commonly used.
ext3 is the filesystem that runqemu uses by default.

Signed-off-by: Kazuhiro Hayashi <d6ab13038406a238a56011921c4eda80a48396fd@toshiba.co.jp>

congnt-tsdv/meta-debian,congnt-tsdv/meta-debian,meta-debian/meta-debian,congnt-tsdv/meta-debian,nghiaht-tsdv/meta-debian,wwright2/meta-debian,wwright2/meta-debian,congnt-tsdv/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,rofehr/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,rofehr/meta-debian,wwright2/meta-debian,congnt-tsdv/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,rofehr/meta-debian,rofehr/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,wwright2/meta-debian,wwright2/meta-debian,tienlee/meta-debian,congnt-tsdv/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,rofehr/meta-debian,rofehr/meta-debian