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Store key/value pairs in a CSV file

.. versionadded:: 2016.11.0

Example configuration:

.. code-block:: yaml

    ext_pillar:
      - csv: /path/to/file.csv

    # or

    ext_pillar:
      - csv:
          path: /path/to/file.csv
          namespace: 'subkey'
          fieldnames:
          - col1
          - col2
          - col2

The first column must be minion IDs and the first row must be dictionary keys.
E.g.:

==========  =========   ======
id          role        env
==========  =========   ======
jerry       web         prod
stuart      web         stage
dave        web         qa
phil        db          prod
kevin       db          stage
mike        db          qa
==========  =========   ======

Will produce the following Pillar values for a minion named "jerry":

.. code-block:: python

    {
        'role': 'web',
        'env': 'prod',
    }
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    Read a CSV into Pillar

    :param str path: Absolute path to a CSV file.
    :param str idkey: (Optional) The column name of minion IDs.
    :param str namespace: (Optional) A pillar key to namespace the values under.
    :param list fieldnames: (Optional) if the first row of the CSV is not
        column names they may be specified here instead.
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