ExecuteNetwork: Fix output format issue for int8 when using -w

Change-Id: I594ded82493e9cc48cafa6f00d63769fefba5afe
diff --git a/tests/NetworkExecutionUtils/NetworkExecutionUtils.hpp b/tests/NetworkExecutionUtils/NetworkExecutionUtils.hpp
index 14d7fe5..acdef0f 100644
--- a/tests/NetworkExecutionUtils/NetworkExecutionUtils.hpp
+++ b/tests/NetworkExecutionUtils/NetworkExecutionUtils.hpp
@@ -175,7 +175,10 @@
     if (outputTensorFile.is_open())
     {
         outputTensorFile << outputName << ": ";
-        std::copy(array, array + numElements, std::ostream_iterator<T>(outputTensorFile, " "));
+        for (std::size_t i = 0; i < numElements; ++i)
+        {
+            outputTensorFile << +array[i] << " ";
+        }
     }
     else
     {