Improve close handling for tap feed (now matches handling in place for DCP feed).
Improve close handling for tap feed (now matches handling in place for DCP feed).

Change-Id: If57bd19de4bb4a62a782965ef743a27cf9da738c
Reviewed-on: http://review.couchbase.org/66579
Reviewed-by: Adam Fraser <0755d117a65f9ed4976c36363060a9738d4753eb@couchbase.com>
Tested-by: Adam Fraser <0755d117a65f9ed4976c36363060a9738d4753eb@couchbase.com>

couchbase/go-couchbase