Make the cookie a session-cookie
Make the cookie a session-cookie

To have the the cookie removed immediately after use, the
CONTEXT_STATE_DELETE configuration option should be set to `True`.

Signed-off-by: Ivan Kanakarakis <f60d6943d72436645c4304926eeeac2718a1142c@gmail.com>

SUNET/SATOSA,SUNET/SATOSA,its-dirg/SATOSA