[Paraview] inconsistent UPDATE_TIME_STEPS with multi-port reader

[Olesen, Mark]

I'm noticing some very odd behaviour when using the OpenFOAM
library-based reader (the one that is part of OpenFOAM, not the one
shipped with VTK).

The reader uses SetNumberOfOutputPorts(2), with port 0 corresponding to
normal cell-based volume/point data and port 1 corresponding to any
Lagrangian data such as sprays or particles, etc.

In the initialization, both ports are set with identical values for
vtkStreamingDemandDrivenPipeline::TIME_STEPS() and
vtkStreamingDemandDrivenPipeline::TIME_RANGE().