Flaky test: HTTPClientTests.testSSLHandshakeErrorPropagation

[Lukasa]

Failed on #333

Test Case 'HTTPClientTests.testSSLHandshakeErrorPropagation' started at 2021-01-22 17:22:24.646
/code/Tests/AsyncHTTPClientTests/HTTPClientTests.swift:2705: error: HTTPClientTests.testSSLHandshakeErrorPropagation : XCTAssertEqual failed: ("nil") is not equal to ("Optional(NIOSSL.NIOSSLError.uncleanShutdown)") -