CBQE-0 fix upgrade test with
additional verify test.

Change-Id: I26f187466b5cfd3d5b6bc38e279b5d7f499b0b19
Reviewed-on: http://review.couchbase.org/36499
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>