pgsql: Make CheckRequiredParameterValues() depend upon correct

Log Message:
-----------
Make CheckRequiredParameterValues() depend upon correct combination
of parameters. Fix bug report by Robert Haas that error message and
hint was incorrect if wrong mode parameters specified on master.
Internal changes only. Proposals for parameter simplification on
master/primary still under way.

Modified Files:
--------------
    pgsql/src/backend/access/transam:
        xlog.c (r1.401 -> r1.402)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c?r1=1.401&r2=1.402)
    pgsql/src/include/catalog:
        pg_control.h (r1.51 -> r1.52)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_control.h?r1=1.51&r2=1.52)