LU-5092 nodemap: add structure to hold nodemap config

LU-5092 nodemap: add structure to hold nodemap config

This patch moves global state variables into a configuration
structure so that new configurations can be more easily loaded and
swapped into the active role.

Signed-off-by: Kit Westneat <kit.westneat@gmail.com>
Change-Id: Ib0d51d56154d5e831b13f2935feab9bd73944bcc
Reviewed-on: http://review.whamcloud.com/14254
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>