LU-3319 procfs: move lmv proc handling over to seq_file

LU-3319 procfs: move lmv proc handling over to seq_file

In order to support 3.10+ kernels for clients we adapt
the lmv proc handling to using seq_files.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I34f58c3a484ee79b41b59d4a60f6a21726373152
Reviewed-on: http://review.whamcloud.com/7291
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Peng Tao <bergwolf@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>