The removed warning was meant as suggestion to
developers to implement a scale_manager. However,
returning None for not implemented classes is a
deliberate choice. Remove this log line from
production sites and developers can always decide
to not return None.
story: 2007803
task: 40064
Change-Id: I85f0c89081007fbbbfe00c7cbeebf0ad837cedf5
Signed-off-by: Spyros Trigazis <spyridon.trigazis@cern.ch>