pgstatsinfo - pg_statsinfo: Logger should not shutdown before any other

Log Message:
-----------
Logger should not shutdown before any other threads are alive.
Change list_concat() to free the second argument in the function.

Modified Files:
--------------
    pg_statsinfo/bin:
        collector.c (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/collector.c?r1=1.4&r2=1.5)
        logger.c (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/logger.c?r1=1.5&r2=1.6)
        snapshot.c (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/snapshot.c?r1=1.4&r2=1.5)
        writer.c (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/writer.c?r1=1.4&r2=1.5)
    pg_statsinfo/bin/pgut:
        pgut-list.c (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pgut/pgut-list.c?r1=1.1&r2=1.2)
        pgut.c (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pgut/pgut.c?r1=1.1&r2=1.2)
    pg_statsinfo/lib/pgut:
        pgut-be.h (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/pgut/pgut-be.h?r1=1.1&r2=1.2)