We expect lots of tools to be able to install on provider=gce - the
cluster API, kops, kube-up etc.
We introduce a new optional flag to e2e ('tooling') to enable switching
on the tooling, not just the cloud.
This will prove useful for upgrade tests, for example, where the
mechanism will likely vary by tooling, but is currently tightly bound to
the provider (i.e. cloud)
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