Many rubocop fixes

Rakefile

lib/refrepo/g5kchecks_importer.rb

lib/refrepo/gen/oar-properties.rb

lib/refrepo/gen/puppet/bindg5k.rb

lib/refrepo/gen/puppet/dhcpg5k.rb

lib/refrepo/gen/puppet/kadeployg5k.rb

lib/refrepo/gen/wiki/generators/hardware.rb

lib/refrepo/gen/wiki/generators/oar_properties.rb

lib/refrepo/gen/wiki/generators/site_hardware.rb

lib/refrepo/gen/wiki/mw_utils.rb

lib/refrepo/gen/wiki/wiki_generator.rb

lib/refrepo/input_loader.rb

lib/refrepo/valid/homogeneity.rb

lib/refrepo/valid/input/duplicates.rb

lib/refrepo/valid/input/lib/custom_validators.rb

lib/refrepo/valid/input/lib/schema_validator.rb

lib/refrepo/valid/input/monitoring.rb

lib/refrepo/valid/input/schema.rb

lib/refrepo/valid/oar-properties.rb

scripts/edit-input-files.rb