fixed weird timeout default and added some missing plumbing

Timeout default was False, which must have resulted from an editing
error, but we failed to pass it through where it was needed
anyway. Fixed now.

src/ZEO/asyncio/client.py

@@ -705,7 +705,7 @@ def setup_delegation(self, loop):
         from concurrent.futures import Future
         call_soon_threadsafe = loop.call_soon_threadsafe
 
-        def call(meth, *args, timeout=False):
+        def call(meth, *args, timeout=None):
             result = Future()
             call_soon_threadsafe(meth, result, *args)
             return self.wait_for_result(result, timeout)
@@ -714,15 +714,15 @@ def call(meth, *args, timeout=False):
 
     def wait_for_result(self, future, timeout):
         try:
-            return future.result(self.timeout if timeout is False else timeout)
+            return future.result(self.timeout if timeout is None else timeout)
         except concurrent.futures.TimeoutError:
             if not self.client.ready:
                 raise ClientDisconnected("timed out waiting for connection")
             else:
                 raise
 
     def call(self, method, *args, timeout=None):
-        return self.__call(self.call_threadsafe, method, args)
+        return self.__call(self.call_threadsafe, method, args, timeout=timeout)
 
     def call_future(self, method, *args):
         # for tests