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Openstack has a unique derivative datasource
that is gaining usage. Previously the config
drive datasource provided part of this functionality
as well as the ec2 datasource, but since new
functionality is being added to openstack is
seems benefical to combine the used parts into
one datasource just made for handling openstack
deployments.
This patch factors out the common logic shared
between the config drive and the openstack
metadata datasource and places that in a shared
helper file and then creates a new openstack
datasource that readers from the openstack metadata
service and refactors the config drive datasource
to use this common logic.
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When a 404 http code comes back from the fetching of ec2
data, instead of retrying immediatly stop the fetching process
and in the userdata fetching function handle this case as a
special case of no userdata being fetched (an empty string
in this case).
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We had a requirement on boto only to use
boto.utils.get_instance_metadata(). That had actually caused some pain in
the past. This removes a Requires and also one that wasn't python3.
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