LU-3319 procfs: remove unsed proc entry for target handler

LU-3319 procfs: remove unsed proc entry for target handler

With 3.10 and above kernels we end up using a new data
structure for proc handling. In the target handler code
we have an unsed lprocfs_vars so we remove it to avoid
compile issues.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I22d3d3b1aed852df93e448d3b793884344d1719a
Reviewed-on: http://review.whamcloud.com/7929
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>