MB-8327: add new XDCR stats to PDF report

Change-Id: I9961f015ad0d124b4266e0296fcd27360c5558ac
Reviewed-on: http://review.couchbase.org/26451
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>