CBQE-2376: fixing upgrade test issue

Change-Id: I094c973d3d8fb936729dd05eb37654883ee421c5
Reviewed-on: http://review.couchbase.org/40526
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>