MB-10640: Include start/end sequence and snapshot type in marker

The UPR protocol changed and now the snapshot marker includes the
start/end sequence and the snapshot type (disk or in memory).

Change-Id: I606345e83f4c42ba77c078311949742663b05407
Reviewed-on: http://review.couchbase.org/35901
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: Volker Mische <volker.mische@gmail.com>