test: fix flaky test-http-agent-scheduling

test-http-agent-scheduling can be flaky on windows.

Author: jasnell

test/parallel/test-http-agent-scheduling.js

@@ -61,6 +61,7 @@ function defaultTest() {
           assert.strictEqual(ports[ports.length - 1], port);
           makeRequest(url, agent, common.mustCall((port) => {
             assert.strictEqual(ports[ports.length - 1], port);
+            server.closeAllConnections();
             server.close();
             agent.destroy();
           }));
@@ -89,6 +90,7 @@ function fifoTest() {
           assert.strictEqual(ports[1], port);
           makeRequest(url, agent, common.mustCall((port) => {
             assert.strictEqual(ports[2], port);
+            server.closeAllConnections();
             server.close();
             agent.destroy();
           }));
@@ -117,6 +119,7 @@ function lifoTest() {
           assert.strictEqual(ports[ports.length - 1], port);
           makeRequest(url, agent, common.mustCall((port) => {
             assert.strictEqual(ports[ports.length - 1], port);
+            server.closeAllConnections();
             server.close();
             agent.destroy();
           }));