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

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

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

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: Icd19a7c75301e1351d1d116afbc1aa4f7168c2eb
Reviewed-on: http://review.whamcloud.com/7292
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>