At the latest kernel(2.6.37-rc1), server just initialize the forechannel
at init_forechannel_attrs, but don't reflect it to reply.

After initialize the session success, we should copy the forechannel info
to nfsd4_create_session struct.
Reviewed-by: NBenny Halevy <bhalevy@panasas.com>
Signed-off-by: NMi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>