LU-3986 build: eliminate redundant kernel config files

fix lbuild to stop using two different names for kernel config files
delete redundant sles kernel config files

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Change-Id: Idb214c67579028069ad1ad95eba621d80c44c661
Reviewed-on: http://review.whamcloud.com/7713
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Minh Diep <minh.diep@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>