[v1] identity: use AuthOptionsBuilder for v2 auth #3030
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Rather than creating a tokens2.AuthOptions inside the authentication flow for identity v2, allow any structure that implements the tokens2.AuthBuilderOptions interface to be used. The gophercloud.AuthOptions already implements this interface so there is no change to the API. To avoid any API change, add AuthenticateV2Ext() as a version of AuthenticateV2() accepting the interface. This will allow an out of tree identity v2 auth mechanism to be implemented, just like the v3. fixes #2651. ref #1330.