LU-2158 lvfs: remove llog_lvfs.c and other lvfs code from llog

LU-2158 lvfs: remove llog_lvfs.c and other lvfs code from llog

- remove obdfilter/llog_lvfs.c
- remove lgh_file from llog_header

Signed-off-by: Mikhail Pershin <mike.pershin@intel.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I711e047dcb61f3ac62b33c5a21ae32fe87d7efd6
Reviewed-on: http://review.whamcloud.com/5331
Tested-by: Hudson
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>