MB-9343 infinitely retry if upr_add_stream fails

Change-Id: I2e82d7f8988785d1cd20728194171620ff71b7b4
Reviewed-on: http://review.couchbase.org/32890
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>