base: fix for bash: cd: HOME not set

The environment variable HOME is not set, so the bash builtin cd fails
when given no arguments.  login(1) has the job of setting HOME.

Add HOME at the same time that login is avoided.
base: systemd now sets up serial console

We used to set up our own serial console, but now systemd reads kernel
command line and sets one up for us, using the same unit file.

http://0pointer.de/blog/projects/serial-console.html
http://www.freedesktop.org/software/systemd/man/systemd-getty-generator.html
Move custom packages to olpc-au-configs

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Add New Zealand locale

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Add yum repositories

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>