pgsql: Kris Jurka pointed out that the qualified_name production wasn't

Log Message:
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Kris Jurka pointed out that the qualified_name production wasn't
working as intended --- for some reason, FROM a.b.c was getting
parsed as if it were a function name and not a qualified name.
I think there must be a bug in bison, because it should have
complained that the grammar was ambiguous.  Anyway, fix it along
the same lines previously used for func_name vs columnref, and get
rid of the right-recursion in attrs that seems to have confused
bison.

Modified Files:
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    pgsql/src/backend/parser:
        gram.y (r2.479 -> r2.480)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.479&r2=2.480)