bash: Fix chsh command issue.
bash: Fix chsh command issue.

Because there is no /bin/sh in /etc/shells,
chsh command causes error like below.

Password:
chsh: PAM: Authentication failure

Signed-off-by: Masahiro Yamada <76d6c03d331b29d77eaac66c3113243c4dd22703@toshiba.co.jp>

nghiaht-tsdv/meta-debian,tienlee/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian