Bump Ubuntu template to use ubuntu-12.04.3 ISO
Bump Ubuntu template to use ubuntu-12.04.3 ISO

ubuntu-12.04.2 appears to have been pulled.

Signed-off-by: Alex Coles <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@alexbcoles.com>

dotless-de/packer-templates