Add newline between failed test outputs

Author: GeoffreyBooth

tools/test.py

@@ -141,7 +141,7 @@ def PrintFailureHeader(self, test):
       negative_marker = '[negative] '
     else:
       negative_marker = ''
-    print("=== %(label)s %(negative)s===" % {
+    print("\n=== %(label)s %(negative)s===" % {
       'label': test.GetLabel(),
       'negative': negative_marker
     })