Give the start_tls() connection_lost waits their own support timeouts

Wait for on_con_lost with LOOPBACK_TIMEOUT, shorter than the
SHORT_TIMEOUT wrapping the whole client, so a missing connection_lost()
fails at that line.  Use SHORT_TIMEOUT instead of a hard-coded 10 in the
streams test.

Author: gpshead

Lib/test/test_asyncio/test_sslproto.py

@@ -633,7 +633,8 @@ async def client(addr):
                     self.loop.start_tls(tr, proto, client_context),
                     0.5)
 
-            self.assertIsNone(await on_con_lost)
+            self.assertIsNone(
+                await asyncio.wait_for(on_con_lost, support.LOOPBACK_TIMEOUT))
 
         with self.tcp_server(serve, timeout=self.TIMEOUT) as srv:
             self.loop.run_until_complete(

Lib/test/test_asyncio/test_streams.py

@@ -14,6 +14,7 @@
 
 import asyncio
 from test.test_asyncio import utils as test_utils
+from test import support
 from test.support import socket_helper
 
 
@@ -878,7 +879,8 @@ async def server_handler(client_reader, client_writer):
                     ssl_handshake_timeout=0.1)
             client_writer.close()
             with self.assertRaises(ConnectionAbortedError):
-                await asyncio.wait_for(client_writer.wait_closed(), 10)
+                await asyncio.wait_for(client_writer.wait_closed(),
+                                       support.SHORT_TIMEOUT)
             handler_done.set()
 
         async def client(addr):
@@ -899,7 +901,8 @@ async def run_test():
             server_addr = server.sockets[0].getsockname()
 
             await client(server_addr)
-            await asyncio.wait_for(handler_done.wait(), 10)
+            await asyncio.wait_for(handler_done.wait(),
+                                   support.SHORT_TIMEOUT)
             server.close()
             await server.wait_closed()