Fix session logout
There were 2 issues with session logouts, one is that the logout_cookie
was checked and acted on in the wrong place, the other is that the wrong
value was set in the IPASESSION header.
Fixes https://fedorahosted.org/freeipa/ticket/6685
Signed-off-by: Simo Sorce <simo@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>