Remove unused imports from python test scripts

Common/ComputationalGeometry/Testing/Python/CSpline.py

Common/ComputationalGeometry/Testing/Python/KSpline.py

Common/ComputationalGeometry/Testing/Python/closedSplines.py

Common/DataModel/Testing/Python/ImplicitSum.py

...n/DataModel/Testing/Python/LineIntersectQuadraticCells.py

Common/DataModel/Testing/Python/PerlinNoise.py

Common/DataModel/Testing/Python/SelectionLoop.py

Common/DataModel/Testing/Python/TestConvexPointSet.py

Common/DataModel/Testing/Python/TestQuadricClustering.py

Common/DataModel/Testing/Python/TestStaticPointLocator.py

Common/DataModel/Testing/Python/TestStructuredGrid.py

Common/DataModel/Testing/Python/headBone.py

Common/DataModel/Testing/Python/scalarColors.py

Common/DataModel/Testing/Python/scalarConn.py

Common/Transforms/Testing/Python/MatrixToTransform.py

Common/Transforms/Testing/Python/TestThinPlateWarp.py

Common/Transforms/Testing/Python/TestThinPlateWarp3D.py

Common/Transforms/Testing/Python/cylindrical.py

Common/Transforms/Testing/Python/spherical.py

Domains/Microscopy/Testing/Python/testOpenSlideReader.py