fix handling of description in partitions file #20
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Issue #, if available:
Description of changes:
Partitions file recently introduced a new description field to the region. This breaks partition parsing, since current logic only supports region fields that override the existing default values, but not add to them.
Fixed region fields to have additive behavior. Also filtering out description field from parsing for endpoints, since it has no use in endpoints rule engine, but results in a lot of additional copies.
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