Drop the timeout option

This is no longer supported by vagrant

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Simplify outer Vagrantfile

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Don't re-download the base image all the time

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>