Modify testing to only record validation pass/fail

* Changed unit tests to only record known the validation pass/fail
status
 * errors are output as part of the failure message if the result is
 unexpected
 * can turn off validation for each test individually
* Moved some SPV_KHR_vulkan_memory_model tests to be compiled for Vulkan
1.1

Test/baseResults/hlsl.buffer.frag.out

@@ -145,10 +145,7 @@ gl_FragCoord origin is upper left
 0:?     '@entryPointOutput.a' (layout( location=0) out 4-component vector of float)
 0:?     'input' ( in 4-component vector of float FragCoord)
 
-error: SPIRV-Tools Validation Errors
-error: Structure id 50 decorated as BufferBlock for variable in Uniform storage class must follow relaxed storage buffer layout rules: member 7 at offset 128 overlaps previous member ending at offset 171
-  %tbufName = OpTypeStruct %v4float %int %float %float %float %float %float %float %mat3v4float %mat3v4float %mat3v4float %mat3v4float
-
+Validation failed
 // Module Version 10000
 // Generated by (magic number): 80007
 // Id's are bound by 73