Bring in fixes from VTK head.

Specifically, bring in fixes to vtkScalarBarActor
so that annotations are drawn properly on horizontally-
oriented scalar bars.

Change-Id: I778e6f163e541b036ce47d89db63237cb6da78cd
Merge topic 'nudge-vtk' into next

6ae2da1 Bring in fixes from VTK head.