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Uses cepko in order to gather the server context from the VM.
For more information about CloudSigma's Server Context:
http://cloudsigma-docs.readthedocs.org/en/latest/server_context.html
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Uses dmi data to detect if this instance of cloud-init is running
in the CloudSigma's infrastructure.
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Cleans up and uses the server's name if the latter is set. Otherwise
the first part from uuid is being used.
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Return a list of data sources that match this set of dependencies
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