Log Message:
-----------
Arrange to explicitly stop the pgstat processes at the same time we
begin the shutdown checkpoint; there isn't anything left for them to do,
so we may as well ensure that they shut down sooner rather than later.
Per discussion.

Modified Files:
--------------
    pgsql-server/src/backend/postmaster:
        pgstat.c (r1.74 -> r1.75)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/postmaster/pgstat.c.diff?r1=1.74&r2=1.75)
        postmaster.c (r1.403 -> r1.404)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/postmaster/postmaster.c.diff?r1=1.403&r2=1.404)
    pgsql-server/src/include:
        pgstat.h (r1.23 -> r1.24)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/pgstat.h.diff?r1=1.23&r2=1.24)

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