NFSD: Update the GETATTR3res encoder to use struct xdr_stream

As an additional clean up, some renaming is done to more closely
reflect the data type and variable names used in the NFSv3 XDR
definition provided in RFC 1813. "attrstat" is an NFSv2 thingie.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>