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Read metadata from metadata server at base_url
:returns: dictionary of retrieved metadata and user data containing the
following keys: meta-data, user-data
:param: base_url: meta data server's base URL
:param: url_params: dictionary of URL retrieval parameters. Valid keys are
`retries`, `sec_between` and `timeout`.
:raises: InvalidMetadataException upon network error connecting to metadata
URL, error response from meta data server or failure to
decode/parse metadata and userdata payload.
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