Fixes after first review


config/ac-macros/ha_ndbcluster.m4:
  WL#3201
    Undo change
config/ac-macros/plugins.m4:
  WL#3201
    Remove unneccesary use of AC_DEFUN
    fix shell script to be more portable
configure.in:
  WL#3201
    Remove use of word "engine" when desribing partition module
    Undo ndb config files change
sql/ha_partition.cc:
  WL#3201
    Remove use of word "engine" when desribing partition module
sql/handler.cc:
  WL#3201
    Add comment describing installed_htons array