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.tristream-append.geom.out

@@ -105,10 +105,7 @@ output primitive = triangle_strip
 0:?         'TriStream' ( temp structure{})
 0:?   Linker Objects
 
-error: SPIRV-Tools Validation Errors
-error: Output variable id <23> is used by entry point 'main' id <4>, but is not listed as an interface
-  %TriStream_1 = OpVariable %_ptr_Output_GSPS_INPUT Output
-
+Validation failed
 // Module Version 10000
 // Generated by (magic number): 80007
 // Id's are bound by 57