Fix flaky integration test #544

Job	Run time
Check whether tests need to be run based on diff	29s
Build Antrea image to be used for Kind e2e tests	3m 44s
Build Flow Aggregator image to be used for Kind e2e tests	2m 26s
E2e tests on a Kind cluster on Linux (noEncap)	36m 24s
E2e tests on a Kind cluster on Linux with all features enabled	53m 36s
E2e tests on a Kind cluster on Linux for Flow Visibility	25m 32s
E2e tests on a Kind cluster on Linux with non default values (proxyAll=true, LoadBalancerMode=DSR...	43m 53s
E2e tests on a Kind cluster on Linux	43m 8s
E2e tests on a Kind cluster on Linux (hybrid)	37m 28s
Antrea-native (VLAN) secondary network tests on a Kind cluster on Linux	3m 28s
NetworkPolicy conformance tests on a Kind cluster on Linux	8m 42s
Test installation using 'antctl check' command	3m 24s
API compatible with client version N-1	8m 14s
API compatible with client version N-2	8m 38s
Upgrade from Antrea version N-1	8m 35s
Upgrade from Antrea version N-2	9m 10s
Validate metrics in Prometheus document match running deployment's	2m 4s
Delete uploaded images	2s
	4h 58m 57s

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