pass nodefile arg and absolutize datapath for cluster_run

The former enables cbcollect_info on cluster_run clusters. And the
later was requested separately.

Change-Id: I175e6efd8b85c7a563f1c529669b849cbf74c865
Reviewed-on: http://review.couchbase.org/37819
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>