[Piglit] fbo-incomplete-texture tests

[Brian Paul]

Hi Ian,

I'm looking at these tests which you added in October.

 From an implementation point of view, I guess I can see why the FBO 
should be incomplete when the texture is incomplete.  But I don't see 
any language in the GL or extension specs about this.

BTW, fbo-incomplete-texture-01 is failing with the NVIDIA driver, as 
with Mesa.  Your git commit message indicates that the test passes 
with NVIDIA.

-Brian