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Ensure framebuffer is active before read/draw pixels.

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:fix_get_set_pixel_calls into master

SetPixel/GetPixel API on vtkOpenGLRenderWindow did not ensure that the frame buffer object is used to render into was made active before doing the draw/read pixel calls. This could have odd effects in applications with multiple render-windows. Fixed that.

Also fixes potential glDrawBuffer/glReadBuffer calls being called with invalid buffer id when GL_DRAW_BUFFER, GL_READ_BUFFER were no defined.

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