pgstatsinfo - pg_statsinfo: * Fix unlink_unwanted_autovacuum_logfile().

Log Message:
-----------
* Fix unlink_unwanted_autovacuum_logfile().
- Previously, we failed on get_stats() when multi DB were monitored.

Modified Files:
--------------
pg_statsinfo/pg_statsinfo/stats_info:
stats_info.c (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/stats_info.c?r1=1.4&r2=1.5)
stats_info.sql.in (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/stats_info.sql.in?r1=1.5&r2=1.6)
stats_info_sql.h (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/stats_info_sql.h?r1=1.4&r2=1.5)
uninstall_stats_info.sql (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/pg_statsinfo/stats_info/uninstall_stats_info.sql?r1=1.4&r2=1.5)