Remove cbbrowse_logs_cluster script.

Seemingly it's not used by anyone.

Change-Id: Iddd5131005e227bbfab741fa263d9e6f07f2cb39
Reviewed-on: http://review.couchbase.org/35009
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>