MB-8819 get node advertised_version from the heartbeat

Change-Id: I4665aa0ee076b4477877e528600f74e3b86ace62
Reviewed-on: http://review.couchbase.org/28209
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>