To me, it seems a bit strange from user experience point of view to have suggestions for what login / password to use.

/reviewed-on nexedi/erp5!67
(cherry picked from commit 8fa68aa9)

Conflicts:
	bt5/erp5_web_renderjs_ui/SkinTemplateItem/portal_skins/erp5_web_renderjs_ui/WebSite_viewRecoverAccount.zpt
	bt5/erp5_web_renderjs_ui/SkinTemplateItem/portal_skins/erp5_web_renderjs_ui/WebSite_viewResetPassword.zpt
	bt5/erp5_web_renderjs_ui/SkinTemplateItem/portal_skins/erp5_web_renderjs_ui/login_form.zpt