LU-3319 procfs: update nodemap proc handling to seq_files

LU-3319 procfs: update nodemap proc handling to seq_files

Migrate all nodemap proc handling to using strictly
seq_files.

Change-Id: I3dd338789de1cc266cdb37df7f4083b2cb9b6da5
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Reviewed-on: http://review.whamcloud.com/8816
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Andrew Perepechko <andrew_perepechko@xyratex.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Joshua Walgenbach <jjw@iu.edu>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>