hs-test: failed summary fix

Remove failed-summary.log from the previous run, otherwise it might be
displayed if all tests pass.

Type: test
Change-Id: I435de37e298105ed5b92012fe4da3cda3a0670b6
Signed-off-by: Matus Fabian <matfabia@cisco.com>
diff --git a/extras/hs-test/hs_test.sh b/extras/hs-test/hs_test.sh
index 5d94ea8..85c0dd7 100644
--- a/extras/hs-test/hs_test.sh
+++ b/extras/hs-test/hs_test.sh
@@ -140,4 +140,8 @@
 "\nFull Stack Trace:
 \(.Failure.Location.FullStackTrace)\n" end) end)' summary/report.json > summary/failed-summary.log \
 	&& echo "Summary generated -> summary/failed-summary.log"
+else
+    if [ -e "summary/failed-summary.log" ]; then
+        rm summary/failed-summary.log
+    fi
 fi