Provide ability to disable/enable caching of form values for batch connect apps

[ericfranz]

Related Discourse topics:

1. https://discourse.osc.edu/t/override-caching-of-attribute-values-in-user-form-for-interactive-apps/676
2. https://discourse.osc.edu/t/disable-autofill-in-dashboard/456

This could be set system wide, or per batch connect app, or per attribute with this pseudocode:

def cache_attribute_value?
  if attribute_has_cache_set_to_true_or_false?
    attribute_cache_setting_value
  elsif app_has_cache_set_to_true_or_false?
    app_cache_setting_value
  elseif system_wide_has_cache_set_to_true_or_false?
    systemwide_cache_setting_value
  else
    true
  end
end

• To specify the attribute cache setting in the form.yml, use enable_caching_attr_value: true or enable_caching_attr_value: falsein the settings for the specified attribute.
• To specify the app wide cache setting in the form.yml, use enable_caching_attr_values: true or enable_caching_attr_values: false in the top level of the yaml (along with cluster:, form: and attributes:
• To specify the app wide cache setting system wide, set the environment variable OOD_BATCH_CONNECT_CACHE_ATTR_VALUES=FALSE (or any valid falsy value for an env var for OnDemand

  ondemand/apps/dashboard/config/configuration_singleton.rb

  Line 262 in fba5513

  FALSE_VALUES=[nil, false, '', 0, '0', 'f', 'F', 'false', 'FALSE', 'off', 'OFF', 'no', 'NO']

  )

Also, there may be a better name than cache for this.