Set ERL_CRASH_DUMP in cluster_run.

Change-Id: Ie48d159f4c69c21f2273ff5a84ff4710d3890424
Reviewed-on: http://review.couchbase.org/34948
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Ensure all our beams have different ERL_CRASH_DUMPs.

Change-Id: I9ab9e4df596ac254e2bc8f92878b31a2911be6d1
Reviewed-on: http://review.couchbase.org/34949
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>