used 2.0.0 as baseline build

Change-Id: I160305c359f6a4f74a5d566e270306e6a43dc7a0
Reviewed-on: http://review.couchbase.org/24242
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>