test_asynchat is no longer expected to produce output.

also, wait for threads to finish before proceeding.

Lib/test/output/test_asynchat

@@ -1,3 +0,0 @@
-test_asynchat
-Connected
-Received: 'hello world'

Lib/test/test_asynchat.py

@@ -6,7 +6,7 @@ import unittest
 from test import test_support
 
 HOST = "127.0.0.1"
-PORT = 54321
+PORT = 54322
 
 class echo_server(threading.Thread):
 
@@ -67,6 +67,7 @@ class TestAsynchat(unittest.TestCase):
         c.push("hello ")
         c.push("world\n")
         asyncore.loop()
+        s.join()
 
         self.assertEqual(c.contents, 'hello world')
 
@@ -79,6 +80,7 @@ class TestAsynchat(unittest.TestCase):
         c.push("hello ")
         c.push("world\n")
         asyncore.loop()
+        s.join()
 
         self.assertEqual(c.contents, 'hello ')