Fixes bug introduced by 74ec34b1. When state files were loaded with timestep 0,
the time value wasn't being set on vtkPVView. vtkPVView::SetViewTime() compared
the old time value to the new one without regard for whether VimeTimeValid was
set. This fixes that issue.

Added a test that loads Exodus state file (for ParaView 3.14.1 to test backwards
compatibility as well). The state file is loaded using the command line
argument for loading state file.

Change-Id: Ib5c1e237617cfb47a0fa3e948e4be554db89d9ed