Remove tess/geom tests relying on default PointSize

Remove tess/geom tests relying on default PointSize

Some of these test cases assumed a default point size of 1.0 in
tessellation and geometry stages (as in GLES), but in Vulkan shaders
have to explicitly write to PointSize or the results are undefined.

Removed tests:
- dEQP-VK.tessellation.geometry_interaction.point_size.vertex_set_control_set
- dEQP-VK.tessellation.geometry_interaction.point_size.vertex_set_eval_default
- dEQP-VK.tessellation.geometry_interaction.point_size.vertex_set_evaluation_set_geometry_default

Public issue #26

Change-Id: I987580c0b7e638910c99f62c1d65b5722272f818