We need to enforce kernel coding style, and check for tabs
instead of spaces by default.

Signed-off-by: Peng Tao <peng_tao@emc.com>
Change-Id: I26fc5a5c6d2e629eb284ac604977d09ebe41dc53
Reviewed-on: http://review.whamcloud.com/2610


Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>