fixed a test race condition, I hope

src/ZEO/tests/ConnectionTests.py

@@ -16,7 +16,6 @@ import contextlib
 import os
 import time
 import socket
-import asyncore
 import threading
 import logging
 
@@ -192,31 +191,16 @@ class CommonSetupTearDown(StorageTestBase):
     def pollUp(self, timeout=30.0, storage=None):
         if storage is None:
             storage = self._storage
-        # Poll until we're connected.
-        now = time.time()
-        giveup = now + timeout
-        while not storage.is_connected():
-            asyncore.poll(0.1)
-            now = time.time()
-            if now > giveup:
-                self.fail("timed out waiting for storage to connect")
-            # When the socket map is empty, poll() returns immediately,
-            # and this is a pure busy-loop then.  At least on some Linux
-            # flavors, that can starve the thread trying to connect,
-            # leading to grossly increased runtime (typical) or bogus
-            # "timed out" failures.  A little sleep here cures both.
-            time.sleep(0.1)
+        storage.server_status()
 
     def pollDown(self, timeout=30.0):
         # Poll until we're disconnected.
         now = time.time()
         giveup = now + timeout
         while self._storage.is_connected():
-            asyncore.poll(0.1)
             now = time.time()
             if now > giveup:
                 self.fail("timed out waiting for storage to disconnect")
-            # See pollUp() for why we sleep a little here.
             time.sleep(0.1)