Deprecate vtkOpenGLPolyDataMapper.

Deprecated vtkOpenGLPolyDataMapper. Added it to the coverage exclude list. Also
removed a test TestOpenGLPolyDataMapper since vtkOpenGLPolyDataMapper is
deprecated anyways.

Change-Id: I087eaf21b8cff22d1184b5725b72158a54f6a65e
Merge topic 'deprecate_vtkOpenGLPolyDataMapper' into master

2bc3308b Deprecate vtkOpenGLPolyDataMapper.