Fixed leaks on exiting.

Pyhton wasn't finalized before process module was destroyed. That lead to proxy
references being released later than expected and hence they were leaking.
Finalzing Python sooner addresses that isssue.

Change-Id: I310d7c8bfea6549dbe36c6c02adc99e9ebfe9416
Merge topic 'refactor_python_interpretor' into next

0344875 Fixed leaks on exiting.
Update VTK to latest master.

Change-Id: I5e7280b8864b1f251a0287ab9531e5b47635ff77
Merge topic 'refactor_python_interpretor' into next

9719076 Update VTK to latest master.