Add API and notification to controller node IP address (and changes).

Controller now needs to listen for storage notifcation and it will
dispatch updates if the controller node IPs change.

We now have three different types of updates in the Controller.updates
queue ==> Refactored to use different update classes that implement a
common IUpdate interface instead of a several types and a switch
statemet.

Add unit test for Controller.updates queue

Retab that caused some unrelated chagnes but now now more tabs:
    flconext, addInfoProvider, removeInfoProviderm getControllerInfo

Retab also causes changes in flcontext: that's only indentation.

Needed to touch quite some files to refactoring: rename
IHARoleListener -> IHAListener

[#29035681]