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The previous jessie image had a broken cloud-init, which would use an
Ubuntu-specific 'nobootwait' argument when mounting disks.  We now
override that in the image.

Fix #22549

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Now that we always populate the local instance, we don't need a getter.

Now we have Ubernetes-Lite, an AWSCloud can span multiple AZs.

It can't any more; this simplifies calling code.

By storing the VPC ID on AWSCloud, we avoid the need to requery or to
pass it around.

Makes it clearer that we are making an AWS API call

We need getSelfAWSInstance to be working anyway; we might as well build
it early, and then we can use its methods to extract e.g. the VPC ID

Now that we can't build an awsInstance from metadata, because of the
PrivateDnsName issue, we might as well simplify the arguments.

Create a 'placeholder' method though - newAWSInstanceFromMetadata - that
documents the desire to use metadata, shows how we would get it, but
links to the bug which explains why we can't use it.

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