MB-11122 Pass port_server_send_eol to xdcr_proxy port server.

Change-Id: I56060490d023fcd5ae1d010a952849d2af975906
Reviewed-on: http://review.couchbase.org/37194
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>