Remove per node uuid from default config.

Change-Id: I94a99053777bce942868f1a27d4808acf1d31992
Reviewed-on: http://review.couchbase.org/35293
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Expose ns_config instance uuid as {node, node(), uuid}.

Change-Id: I3712840df56415406bff6a4f010378cb16e0f53d
Reviewed-on: http://review.couchbase.org/35294
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>