LU-1252 recovery: don't always swap nidtbl entries

LU-1252 recovery: don't always swap nidtbl entries

Swap nidtbl entries only when server and client are using different
byte order.

Signed-off-by: Jinshan Xiong <jinshan.xiong@whamcloud.com>
Change-Id: I58ebe98e81040ec187f4ecd75020b7b84c7d8904
Reviewed-on: http://review.whamcloud.com/2410
Tested-by: Hudson
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>