Modify vtkTransformInterpolator::InitializeInterpolation() to set the
interpolation type first, then initialize the interpolators, AND THEN
set the number of tuples. The quaternion interpolator may not care, but
for vtkTupleInterpolator, this ordering is CRITICAL, as either of the
first two steps may unset the number of tuples, resulting in a broken
interpolator.

Change-Id: Id4787bb304ca4b3e8a9501e5583b4caf59dd507f