* Send x-forwarded-for in Okta Push Factor request
Why:
In order for Okta to properly report the location of the authentication
attempt, the X-Forwarded-For header must be included in the request to
Okta (if it exists).
This change addresses the need by:
* Duplicating the value of X-Forwarded-For if it's passed through to the
auth backend
* Add changelog entry for 12320
