[web session] fix session handling so we get a chance to have for instance the 'forgotpwd' feature working on a site where anonymous are not allowed
fix several pbs:
* we need a session id and a session cookie anyway, else subsequent http queries are unrelated
* this imply some changes in the session attribution workflow for session without a cnx
* some views/selectors must be fixed for cases where session has no cnx
On the way, avoid unnecessary Redirect on successful login.
closes #750543
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"""server side objects
"""