passing jdk9 `--add-opens` for netty.DnsResolverUtil on JDK9+ #571

Job	Run time
integration (integration test, .ci/tests/integration/e2e.yaml)	45m 17s
integration (integration test with tls, .ci/tests/integration/e2e_with_tls.yaml)	25m 55s
integration (integration test with oauth2, .ci/tests/integration-oauth2/e2e.yaml)	23m 0s
integration (integration test with downloader, .ci/tests/integration-oauth2/e2e_with_downloader.y...	19m 51s
	1h 54m 3s

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