LU-5275 lprocfs: remove all non-seq file functions

LU-5275 lprocfs: remove all non-seq file functions

With the completion of the move to seq_file based
proc handling for lustre we can remove all the
no longer used non-seq_file handling routines.
Rename lprocfs_try_remove_proc_entry to match the
new function in newer kernels and RHEL6.6 that
does a similar thing (remove_proc_subtree).

Change-Id: Ieff19f0216770da94f29562d51abcbf5869bad34
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Reviewed-on: http://review.whamcloud.com/12235
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>