Peter Hamilton 072d55a9c3 Add support for the NewAttribute structure
This change adds support for the NewAttribute structure added
in KMIP 2.0. The NewAttribute structure is a basic container
structure that contains a single attribute instance for use by
attribute operations. A new unit test suite has been added to cover
the new additions.

Partially implements #547
2019-11-18 10:12:33 -05:00
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