Add 1.6.x release notes from Todd
Add 1.6.x release notes from Todd

Change-Id: Ia998fc7f8e4c520744c47986944b9dfec539edfd
Reviewed-on: http://gerrit.cloudera.org:8080/8674
Tested-by: Kudu Jenkins
Reviewed-by: Mike Percy <e07a1fd797b473a9c849e618aa2ce06d8055760b@apache.org>

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