CBQE-928: seq_no > 1 for upgrade 1.8 ->2.*

Change-Id: I8a1e1615ffb71d08a18951d81e290a72719781ed
Reviewed-on: http://review.couchbase.org/24188
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>