Add set basic auth param (#413)

* addint redirect capability to sign_out

* updating changelog

* Add a new param to set the Authorization header to up-stream systems as Basic user:password

* Resolving code review

* mutual exclusiv changes for Basic and Bearer Authorization header

* Fixed the merge mixup and comment error

* Updated changelog and fixed typo

* Adding the new entry in changelog

Co-authored-by: Costel Moraru <costel.moraru-germany@ibm.com>