NIFI-5465: Set the Idle Timeout on jetty connectors to the same as th…

[markap14]

…e Request Timeout.

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to ensure the following steps have been taken:

For all changes:

• Is there a JIRA ticket associated with this PR? Is it referenced
  in the commit message?

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Note:

Please ensure that once the PR is submitted, you check travis-ci for build issues and submit an update to your PR as soon as possible.

[markap14]

An easy way to test the PR is to try running the following code (updating the URL in the second line of code to point to a running HandleHttpRequest processor):

public static void main(final String[] args) throws Exception {
        final URL url = new URL("http://localhost:8153/test");
        final URLConnection conn = url.openConnection();

        final HttpURLConnection connection = (HttpURLConnection) conn;
        connection.setRequestMethod("POST");

        connection.setDoOutput(true);
        connection.setFixedLengthStreamingMode(1_000_000);

        connection.connect();

        final OutputStream out = connection.getOutputStream();
        for (int i=0; i < 500_000; i++) {
            out.write('A');
        }

        System.out.println("Sleeping...");
        Thread.sleep(35000);

        for (int i=0; i < 500_000; i++) {
            out.write('A');
        }


        // read the output from the server
        final BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        final StringBuilder stringBuilder = new StringBuilder();

        String line = null;
        while ((line = reader.readLine()) != null) {
            stringBuilder.append(line + "\n");
        }

        System.out.println(stringBuilder.toString());
    }

Before the PR, this caused an Exception after sleeping and NiFi did not handle the request. After the PR, NiFI handles it properly and returns the expected response.