LU-8824 nodemap: load nodemap definitions first

LU-8824 nodemap: load nodemap definitions first

ZFS index files return keys in hash order instead of key numerical
order. This means that nodemap definitions could be returned after
the ID mapping and range definitions, causing the load code to break.
This change loads the config in two passes, ensuring that the nodemap
creation would occur first.

Test-Parameters: envdefinitions=SLOW=yes testlist=sanity-sec
Test-Parameters: envdefinitions=SLOW=yes mdtfilesystemtype=zfs mdsfilesystemtype=zfs ostfilesystemtype=zfs testlist=sanity-sec
Signed-off-by: Kit Westneat <kit.westneat@gmail.com>
Change-Id: I97dac2e8fb2e7f2e0a0a6bd07f743d3379178890
Reviewed-on: http://review.whamcloud.com/23849
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>