reassign owned to change the ownership for op class and family

Currently REASSIGN OWNED complains "unexpected classid" for operator
class and family.

For example,

create two users, user1 and user2

under user1:
create type oxetype as enum ('oxe1');
create operator class oxeops
default for type oxetype using btree as
function 1 array_lower(anyarray,integer);

and then observe "unexpected classid" error:
reassign owned by user1 to user2

So I propose a patch that goes against head, and it would be great to
get it backported to at least 8.3 branch

Comments?

Asko Tiidumaa
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Skype, Sr DBA