CBQE-981: check seq_id after offline upgrade

Change-Id: I75e2df781cbc5660bc20d20bedf206dadcfe8b41
Reviewed-on: http://review.couchbase.org/24058
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>