bootstrap/config.py: mv locale setup from bootstrap.sh

bootstrap/config.py: mv locale setup from bootstrap.sh

In future, samba developers could run `bootstrap.sh` to update
dependencies on their workstation, this is very useful when new people
get on board or new dependencies introduced.

But currenly it will override locale, which is not expected for this case.

Remove locale setup cmds from bootstrap.sh, add a separate script for this.

Although this script is written in a generic way and has no variable so far,
still follow the same routine as `bootstrap.sh` to keep consistent.

Signed-off-by: Joe Guo <joeg@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>