pgsql: Remove references to pgsql-ports and pgsql-patches mailing lists

Log Message:
-----------
Remove references to pgsql-ports and pgsql-patches mailing lists from
various documentation, since those lists are now dead/deprecated.
Point to pgsql-bugs and/or pgsql-hackers as appropriate.

Modified Files:
--------------
    pgsql:
        configure (r1.622 -> r1.623)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.622&r2=1.623)
        configure.in (r1.581 -> r1.582)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.581&r2=1.582)
    pgsql/contrib/pg_standby:
        pg_standby.c (r1.16 -> r1.17)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_standby/pg_standby.c?r1=1.16&r2=1.17)
    pgsql/doc:
        bug.template (r1.50 -> r1.51)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/bug.template?r1=1.50&r2=1.51)
    pgsql/doc/src/sgml:
        problems.sgml (r2.28 -> r2.29)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/problems.sgml?r1=2.28&r2=2.29)