Updated for new underware and new higher minimum protocol

src/ZEO/tests/protocols.test

@@ -17,15 +17,15 @@ Let's start a Z308 server
     ... '''
 
     >>> addr, admin = start_server(
-    ...    storage_conf, dict(invalidation_queue_size=5), protocol=b'Z308')
+    ...    storage_conf, dict(invalidation_queue_size=5), protocol=b'Z309')
 
 A current client should be able to connect to a old server:
 
     >>> import ZEO, ZODB.blob, transaction
     >>> db = ZEO.DB(addr, client='client', blob_dir='blobs')
     >>> wait_connected(db.storage)
-    >>> db.storage._connection.peer_protocol_version
-    b'Z308'
+    >>> db.storage.protocol_version
+    b'Z309'
 
     >>> conn = db.open()
     >>> conn.root().x = 0
@@ -85,13 +85,6 @@ A current client should be able to connect to a old server:
     ...    f.read()
     b'blob data 2'
 
-Note that when taking to a 3.8 server, iteration won't work:
-
-    >>> db.storage.iterator()
-    Traceback (most recent call last):
-    ...
-    NotImplementedError
-
     >>> db2.close()
     >>> db.close()
     >>> stop_server(admin)
@@ -107,13 +100,13 @@ And the other way around:
 
 Note that we'll have to pull some hijinks:
 
-    >>> import ZEO.zrpc.connection
-    >>> old_current_protocol = ZEO.zrpc.connection.Connection.current_protocol
-    >>> ZEO.zrpc.connection.Connection.current_protocol = b'Z308'
+    >>> import ZEO.asyncio.client
+    >>> old_protocols = ZEO.asyncio.client.Protocol.protocols
+    >>> ZEO.asyncio.client.Protocol.protocols = [b'Z309']
 
     >>> db = ZEO.DB(addr, client='client', blob_dir='blobs')
-    >>> db.storage._connection.peer_protocol_version
-    b'Z308'
+    >>> db.storage.protocol_version
+    b'Z309'
     >>> wait_connected(db.storage)
     >>> conn = db.open()
     >>> conn.root().x = 0
@@ -174,23 +167,9 @@ Note that we'll have to pull some hijinks:
     ...    f.read()
     b'blob data 2'
 
-Make some old protocol calls:
-
-    >>> db.storage._server.rpc.call('getSerial', conn.root()._p_oid
-    ...      ) == conn.root()._p_serial
-    True
-
-    >>> p, s, v, x, y = db.storage._server.rpc.call('zeoLoad',
-    ...                                             conn.root()._p_oid)
-    >>> (v, x, y) == ('', None, None)
-    True
-    >>> db.storage.load(conn.root()._p_oid) == (p, s)
-    True
-
-
     >>> db2.close()
     >>> db.close()
 
 Undo the hijinks:
 
-    >>> ZEO.zrpc.connection.Connection.current_protocol = old_current_protocol
+    >>> ZEO.asyncio.client.Protocol.protocols = old_protocols