CCBC-300 Use 'Uncommited' instead of 'Evolving' according to attributes(5)

Section 'Compatibility with Earlier Interface Classification Schemes'
http://www.unix.com/man-page/opensolaris/5/attributes/

Change-Id: I496471bc65de94cadb85c230510c90f7699c0efd
Reviewed-on: http://review.couchbase.org/30883
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>