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Previously we expected the leaf certificate to be present in public data
and the chain of intermediate CAs to be present in optional data. After
discussion it was agreed to update IoTivity to expect the entire chain
of certificates to be present in public data.

Change-Id: Ib4a53b31451205da4b06c41404b5088568844825
Signed-off-by: Alex Kelley <alexke@microsoft.com>