Make keeping the tools updated easy.

We currently clone a number of trees but offer no obvious way to keep
them up to date - and users are running into bugs with old, outdated
trees. Some automation may help :).

Change-Id: I2642a38aab6349d43e8b86cf94a1ac979c598077
Remove serial console so all console goes to tty0

While booting, some things require a working console. One of those
things is cloud-init. For whatever reason, ttyS0 being listed as the
last console causes problems with /dev/console usage in Ubuntu 13.04
(raring) that we did not see in 12.10 (quantal).

By using the remove-serial-console element in the seed configuration we
side-step this issue, leading to cloud-init running properly (and thus
generating ssh keys properly).

Fixes bug #1208912

Change-Id: Ic645f58923c869c881ec05b74aa0c822a32e81eb
Add missing overcloudrc.

It is hard to source a file that doesn't exist.

Change-Id: Ib18d753003ed823d5fa3c8a7fc59485c1d5579cf