Make fsino report accurte maxread/maxwrite sizes

Take the smaller of MaxRead/max_send_buffer_size and
MaxWrite/max_recv_bufer_size and give that in Fsinfo.
This is workaround for the Tirpc Problem which can't handle
fragments with krb encryption.

1.5 commit: a2727c19afbb05349cff11f23668b55862b7c8a1

Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>