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Cloned from upstream: https://pagure.io/freeipa/issue/6774

Older clients are also affected by #6718. I noticed the problem when I was testing the vault with FreeIPA 4.4 client and FreeIPA 4.5 server. https://github.com/freeipa/freeipa/pull/532 needs to be backported.

```text
ipa: ERROR: unable to parse cookie header 'ipa_session=MagBearerToken=MiIjMRJWMAl1%2bazkGlIRns2iysA7wxc%2bpSenQtZEMKXSsRAXEcnw2wHEyzOyh8RHgIm5K7YvX1k1tPotRM2ztegX4ODAmOe26%2fP4FLu68AupejDBNmNIENfasrNhUiPowugkkRXBOD%2b%2bsGFFMUZ%2bP7AYPHoW3bE3uN4ftRQwftE11EFTti4a9fVwB4SLKiuU&expiry=1489670819868611;Max-Age=1800;path=/ipa;httponly;secure;': unsupported operand type(s) for +: 'NoneType' and 'datetime.timedelta'
```

Created attachment 1266100 [details]
Proposed patch that can be applied after RHEL 6.9 upstream patches [0]

Created attachment 1266101 [details]
Proposed patch that can be applied after RHEL 6.9 upstream patches [1]

We can probably remove the Max-Age attribute with a rewrite instruction in the apache configuration, but I wonder if we should leave this as a workaround for impacted customers rather than doing it by default.
Max-Age is used to tell the browser when to throw away the cookie, and it is not fundamental, worst case browsers send an expired cookie and they need to renegotiate and will get a new cookie.

Petr, what do you think ?

FreeIPA 4.5.0(1) server sends Set-Cookie header with Max-Age string, that is set by SessionMaxAge directive in httpd configuration. This is part of the header which older clients cannot parse. Older clients understand the cookie with expiration expressed this way: Expires=time_when_cookie_expires. In this format: Expires=Mon, 05 Jun 2017 17:10:07 GMT;