Add support for the CloudSigma server context.

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+=====================
+CloudSigma Datasource
+=====================
+
+This datasource finds metadata and user-data from the `CloudSigma`_ cloud platform.
+Data transfer occurs through a virtual serial port of the `CloudSigma`_'s VM and the
+presence of network adapter is **NOT** a requirement,
+
+  See `server context`_ in the public documentation for more information.
+
+
+Setting a hostname
+~~~~~~~~~~~~~~~~~~
+
+By default the name of the server will be applied as a hostname on the first boot.
+
+
+Providing user-data
+~~~~~~~~~~~~~~~~~~~
+
+You can provide user-data to the VM using the dedicated `meta field`_ in the `server context`_
+``cloudinit-user-data``. By default *cloud-config* format is expected there and the ``#cloud-config``
+header could be omitted. However since this is a raw-text field you could provide any of the valid
+`config formats`_.
+
+If your user-data needs an internet connection you have to create a `meta field`_ in the `server context`_
+``cloudinit-dsmode`` and set "net" as value. If this field does not exist the default value is "local".
+
+
+
+.. _CloudSigma: http://cloudsigma.com/
+.. _server context: http://cloudsigma-docs.readthedocs.org/en/latest/server_context.html
+.. _meta field: http://cloudsigma-docs.readthedocs.org/en/latest/meta.html
+.. _config formats: http://cloudinit.readthedocs.org/en/latest/topics/format.html