Broken proxy configuration on undercloud node affects Redfish-based Ironic calls

Issue

• Undercloud Ironic operations against overcloud nodes via Redfish protocol are blocked because of broken proxy configuration.
• Existing baremetal nodes are in maintenance state, their power state is None.
• It is impossible to introspect or provision baremetal nodes because Ironic is unable to manage them via Redfish protocol because of broken proxy configuration.
• How to update proxy configuration inside undercloud containers.