LU-650 Max possible file size is mutable

LU-650 Max possible file size is mutable

Move maxbytes fields out of wire data part of lov_stripe_md,
it can change when OSTs change their status, e.g. disconnected
or inactivated.

Change-Id: I9fb1f2597df1e98d993792706ac94f469d23a78c
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1327
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Hudson
Tested-by: Yu Jian <yujian@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>