Fix raw Class in sal-distributed-datastore messages

Fixes the use of Class in the messages. Also makes sure exported
constants are really constant.

Change-Id: Ibc0f688e95e8a2c26d30407897aaf7c51323032e
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "Fix raw Class in sal-distributed-datastore messages"