Kill ChangeControl.Factory

Instead use the GenericFactory. You can't use ChangeControl.Factory
inside of REST API handlers. There are only 3 callers of
ChangeControl.Factory. Its easier to remove this than to
keep it around confusing people that are newer to the code
base.

Change-Id: I12361405475a3fa4c2f855187488fdaea51fd696
6 files changed