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)