LU-7160 mgs: Skip processing .bak files on MGS

LU-7160 mgs: Skip processing .bak files on MGS

lctl replace_nids command saves previous version of
config files to file with original_name.bak file name.
This file should never be processed by MGS.

This patch adds code that skips file with .bak extention
from list to be processed by MGS.

Signed-off-by: Artem Blagodarenko <artem.blagodarenko@seagate.com>
Xyratex-bug-id: MRP-2742
Change-Id: I5ad5cf5548d395459d2245394ef3f7764fe8f0ca
Reviewed-on: http://review.whamcloud.com/16428
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>