This hacks makes a mess and works with a whitelist that
completely breaks the generic context passing mechanism.
Replaced by specific guard through default_get overrides
for the models that are sensitive to default value
leaks via context.
E.g. mail.message is sensitive to leaked default_type
context keys that are meant for other models, such
as those passed by the Invoices menus.
bzr revid: odo@openerp.com-20121121101917-izeu4c493un86udf
Olivier Dony
fadd311945