pgstatsinfo - pg_statsinfo: - Add dblink_disconnect() to log cleanup

Log Message:
-----------
- Add dblink_disconnect() to log cleanup function.

Modified Files:
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pg_statsinfo/pg_statsinfo/stats_info:
stats_info.sql.in (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/stats_info.sql.in?r1=1.4&r2=1.5)