Description of problem:
authentication_key no longer exposed in EMS service model.
Delivered by https://github.com/ManageIQ/manageiq/pull/12301 and implemented in last 4.1 errata but missing from 4.2 GA.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Verified in 184.108.40.206.
I simulated a method with this body:
$evm.root['result_key'] = $evm.root['ext_management_system'].authentication_key
selecting the openshift provider. The result_key was populated afterwards with the key.