[Beignet] Piglit test cases failed

[He Junyan]

When I merge our utest to piglit, I find the piglit's cl module check is 
careful and detail.
We now fail all the piglit's CL API check now.
The reason is about two categories:

1. Piglit will give wrong parameters to CL API deliberately and check 
the error code.
     In most cases our error code is not exactly same as the spec and 
causes the failure.
2. Some code use assert such as FATAL_IF and cause the program crash in 
debug mode.

Though I think this is not very critical, but the failure will cause the 
test cases result very ugly.