Reorganize code to avoid duplicate requires

generators/wiki/cpu_parameters.rb

generators/wiki/disk_reservation.rb

generators/wiki/hardware.rb

generators/wiki/lib/mw_utils.rb

generators/wiki/lib/wiki_generator.rb

generators/wiki/oar_properties.rb

generators/wiki/site_hardware.rb

generators/wiki/site_hardware_data.rb

generators/wiki/site_network.rb