Caching credentials and X-Auth-Token header

[notFloran]

Hi,

I try to cache my openstack credentials with the code from the doc (https://github.com/rackspace/php-opencloud/blob/working/docs/userguide/caching-credentials.md).

It works as long as the token is valid, once the token has expired, an authentication request is made but with the header X-Auth-Token set with the expired token.
So the API returns a 401.

I have to add this before the authenticate to fix the problem.

$client->setDefaultOption('headers/X-Auth-Token', null);

Maybe the authenticate method in OpenCloud\OpenStack should delete the header before making the authentication request.

[jamiehannaford]

@notFloran Great catch, thanks for reporting. This also seems like an upstream OpenStack bug to me, since the Rackspace API ignores the X-Auth-Token header when people are authenticating. Checking the existing auth token whilst people are trying to get another doesn't make a lot of sense to me, but I'll see if I can file a bug report or something. I'll also submit a PR for this SDK.

[notFloran]

@jamiehannaford Thanks for the fix !