pgstatsinfo - pg_statsinfo: * Fix some problems for pg_statsinfo on the

Log Message:
-----------
* Fix some problems for pg_statsinfo on the standby server.
  - PostgreSQL sometimes output stderr messages to *.log through system(),
    so in a few cases, pg_statsinfo's logger will go into infinit-loop for
    these unexpected messages...
  - On standby server, pg_statsinfo could not perform age().
    Therefore check the server status and avoid the error to use age().

Modified Files:
--------------
    pg_statsinfo/bin:
        collector_sql.h (r1.12 -> r1.13)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/collector_sql.h?r1=1.12&r2=1.13)
        logger.c (r1.24 -> r1.25)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/logger.c?r1=1.24&r2=1.25)