cubicweb #2430018 cw.web.application 3.15 refactoring breaks openid authentication [validation pending]

prioritynormal
typebug
done in3.15.2
load0.100
load left0.000
closed by#a85e107947e6 [web app] handle Redirect raised during session establishment, as this may be used by eg openid authentication. Closes #2430018