Use newer asyncio to connect accepted sockets (if available).

The new api will be in Python 3.6, and hopefullt, in uvloop soon.

When binding to port 0, make sure we set our address to a 2-tuple, because
IPV6 4-tuples confuse ClientStorage.

src/ZEO/asyncio/mtacceptor.py

@@ -51,6 +51,7 @@ else:
 import asyncore
 import socket
 import threading
+import time
 
 from .server import ServerProtocol
 
@@ -130,7 +131,7 @@ class Acceptor(asyncore.dispatcher):
                 break
 
         if isinstance(addr, tuple) and addr[1] == 0:
-            self.addr = addr = self.socket.getsockname()
+            self.addr = addr = self.socket.getsockname()[:2]
 
         logger.info("listening on %s", str(addr))
         self.listen(5)
@@ -177,20 +178,24 @@ class Acceptor(asyncore.dispatcher):
                 if self.ssl_context is None:
                     cr = loop.create_connection((lambda : protocol), sock=sock)
                 else:
-                    #######################################################
-                    # XXX See http://bugs.python.org/issue27392 :(
-                    _make_ssl_transport = loop._make_ssl_transport
-                    def make_ssl_transport(*a, **kw):
-                        kw['server_side'] = True
-                        return _make_ssl_transport(*a, **kw)
-                    loop._make_ssl_transport = make_ssl_transport
-                    #
-                    #######################################################
-                    cr = loop.create_connection(
-                        (lambda : protocol), sock=sock,
-                        ssl=self.ssl_context,
-                        server_hostname='fu' # http://bugs.python.org/issue27391
-                        )
+                    if hasattr(loop, 'connect_accepted_socket'):
+                        loop.connect_accepted_socket(
+                            (lambda : protocol), sock, ssl=self.ssl_context)
+                    else:
+                        #######################################################
+                        # XXX See http://bugs.python.org/issue27392 :(
+                        _make_ssl_transport = loop._make_ssl_transport
+                        def make_ssl_transport(*a, **kw):
+                            kw['server_side'] = True
+                            return _make_ssl_transport(*a, **kw)
+                        loop._make_ssl_transport = make_ssl_transport
+                        #
+                        #######################################################
+                        cr = loop.create_connection(
+                            (lambda : protocol), sock=sock,
+                            ssl=self.ssl_context,
+                            server_hostname=''
+                            )
 
                 asyncio.async(cr, loop=loop)
                 loop.run_forever()