fix all udx leaks in tests

test/replicate.js

@@ -1341,6 +1341,9 @@ test('cancel block', async function (t) {
 
  t.ok(a.replicator.stats.wireCancel.rx > 0, 'wireCancel stats incremented')
  t.is(a.replicator.stats.wireCancel.rx, b.replicator.stats.wireCancel.tx, 'wireCancel stats consistent')
+
+ n1.destroy()
+ n2.destroy()
 })
 
 test('try cancel block from a different session', async function (t) {
@@ -1378,6 +1381,9 @@ test('try cancel block from a different session', async function (t) {
 
  await a.close()
  await b.close()
+
+ n1.destroy()
+ n2.destroy()
 })
 
 test('retry failed block requests to another peer', async function (t) {
@@ -1415,6 +1421,15 @@ test('retry failed block requests to another peer', async function (t) {
 
  t.alike(await c.get(0), b4a.from('1'))
 
+ n1.destroy()
+ n2.destroy()
+
+ n3.destroy()
+ n4.destroy()
+
+ n5.destroy()
+ n6.destroy()
+
  async function onupload (core, name) {
  t.pass('onupload: ' + name + ' (' + (once ? 'allow' : 'deny') + ')')
 
@@ -1626,6 +1641,9 @@ test('session id reuse does not stall', async function (t) {
 
  t.pass('All blocks downloaded')
  t.is(downloaded, 100, 'Downloaded all blocks exactly once')
+
+ n1.destroy()
+ n2.destroy()
 })
 
 test('restore after cancelled block request', async function (t) {
@@ -1654,6 +1672,9 @@ test('restore after cancelled block request', async function (t) {
  await new Promise(resolve => b.on('append', resolve))
 
  t.is(b.length, a.length)
+
+ n1.destroy()
+ n2.destroy()
 })
 
 test('handshake is unslabbed', async function (t) {