Update VTK to VTK master

Change-Id: I3b8fb4f449d5f1f3e2742a1a2fee20d172dbacfe
Update VTK to fix leaks.

Change-Id: I9b98724e911f773f4219025a9fa69d2f1ccbe759
Merge topic 'update_vtk_master'

7b8e5d1 Update VTK to fix leaks.
a85177d Update VTK to VTK master