test_zeo_config(): Pick a large port number that is more likely to not

exist (no guarantees though, oh well).

src/ZODB/tests/testConfig.py

@@ -81,11 +81,15 @@ class ZODBConfigTest(ConfigTestBase):
         self.assertRaises(ReadOnlyError, self._test, cfg)
 
     def test_zeo_config(self):
-        #self.fail("This test hangs on Debian Linux 2.4.20 i686 unknown")
+        # We're looking for a port that doesn't exist so a connection attempt
+        # will fail.  Instead of elaborate logic to loop over a port
+        # calculation, we'll just pick a simple "random", likely to not-exist
+        # port number and add an elaborate comment explaining this instead.
+        # Go ahead, grep for 9.
         cfg = """
         <zodb>
           <zeoclient>
-            server localhost:9
+            server localhost:56897
             wait false
           </zeoclient>
         </zodb>