test: fix test-net-connect-econnrefused (again)

test-net-connect-econnrefused was recently fixed, but only in certain
circumstances. This change allows it to succeed whether it is invoked
with `node` or `tools/test.py`. Makes sure no Socket handles are left,
which is what the test is trying to determine, rather than failing if
there are no handles of any kind left.

test/pummel/test-net-connect-econnrefused.js

@@ -50,7 +50,8 @@ function pummel() {
 function check() {
   setTimeout(function() {
     assert.strictEqual(process._getActiveRequests().length, 0);
-    assert.strictEqual(process._getActiveHandles().length, 1); // the timer
+    const activeHandles = process._getActiveHandles();
+    assert.ok(activeHandles.every((val) => val.constructor.name !== 'Socket'));
     check_called = true;
   }, 0);
 }