Move printing sub-test information into test harness (#421)

This removes all the duplicated code from each test, and moves it to
test harness so that we have single place where this information is
printed.

Signed-off-by: Radek Szymanski <radek.szymanski@arm.com>

test_conformance/half/cl_utils.c

@@ -58,7 +58,6 @@ uint32_t        gDeviceFrequency = 0;
 uint32_t        gComputeDevices = 0;
 size_t          gMaxThreadGroupSize = 0;
 size_t          gWorkGroupSize = 0;
-int             gFailCount = 0;
 bool            gWimpyMode = false;
 int             gWimpyReductionFactor = 512;
 int             gTestDouble = 0;