Change retry policy to allow for flakiness with parallel tests

Author: stevebux

Makefile

@@ -138,11 +138,8 @@ TEST_CMD := APIGEE_ACCESS_TOKEN="$(APIGEE_ACCESS_TOKEN)" \
 	--api-name=nhs-notify-supplier \
 	--proxy-name="$(PROXY_NAME)" \
 	-s \
-	--reruns 5 \
+	--reruns 1 \
 	--reruns-delay 5 \
-	--only-rerun 'AssertionError: Unexpected 429' \
-	--only-rerun 'AssertionError: Unexpected 504' \
-	--only-rerun 'AssertionError: Unexpected 502' \
 	--junitxml=test-report.xml