pgsql: The particular table names used in the new inheritance regression

Log Message:
-----------
The particular table names used in the new inheritance regression test are
prone to sort differently in different locales, as seen in buildfarm results.
Let's cast to name not text to avoid that.

Modified Files:
--------------
    pgsql/src/test/regress/expected:
        inherit.out (r1.32 -> r1.33)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/inherit.out?r1=1.32&r2=1.33)
    pgsql/src/test/regress/sql:
        inherit.sql (r1.16 -> r1.17)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/inherit.sql?r1=1.16&r2=1.17)