nfsd4: don't try to map gid's in generic rpc code

nfsd4: don't try to map gid's in generic rpc code

commit dc83d6e27fa80babe31c80aa8568f125f72edf57 upstream.

For nfsd we provide users the option of mapping uid's to server-side
supplementary group lists.  That makes sense for nfsd, but not
necessarily for other rpc users (such as the callback client).

So move that lookup to svcauth_unix_set_client, which is a
program-specific method.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>