Sprinkle magic fairy sleep powder on racy test.

src/ZEO/tests/zeo-fan-out.test

@@ -116,6 +116,7 @@ invalidated:
     >>> stop_server(adminaddr0)
     >>> _ = start_server('<filestorage 1>\npath fs\n</filestorage>\n',
     ...                  port=port0)
+    >>> time.sleep(10) # get past startup / verification 
 
     >>> for i in range(1000):
     ...     c1.sync()