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.

Also change NFS_DEFAULT_RECV/SEND_BUFFER_SIZE to 1M

Signed-off-by: Venkateswararao Jujjuri "<jvrao@linux.vnet.ibm.com>
Signed-off-by: Rong Zeng <rongzeng@us.ibm.com>