* passed header key should be converted here, i.e. openAMid -> HTTP_OPENAMID, so 'literal=True' should be removed.
* no need to inherit CookieAuthHelper class.
* use 'external_login' instead of 'login' so that both extract part and authentication part of this plugin should be used, and not used in other authentication plugins.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@40385 20353a03-c40f-0410-a6d1-a30d3c3de9de