bpo-38912: fix close before connect callback in test_asyncio SSL tests (GH-22691)

Reduces the rate at which the ENV CHANGED failure occurs in test_asyncio SSL tests (due to unclosed transport), but does not 100% resolve it.
(cherry picked from commit de73d432bb)

Co-authored-by: Justin Turner Arthur <justinarthur@gmail.com>

Lib/test/test_asyncio/test_events.py

@@ -1075,6 +1075,7 @@ class EventLoopTestsMixin:
                                                ssl=sslcontext_client,
                                                server_hostname='localhost')
         client, pr = self.loop.run_until_complete(f_c)
+        self.loop.run_until_complete(proto.connected)
 
         # close connection
         proto.transport.close()
@@ -1100,6 +1101,7 @@ class EventLoopTestsMixin:
                                           ssl=sslcontext_client,
                                           server_hostname='localhost')
         client, pr = self.loop.run_until_complete(f_c)
+        self.loop.run_until_complete(proto.connected)
 
         # extra info is available
         self.check_ssl_extra_info(client, peername=(host, port),

Misc/ACKS

@@ -70,6 +70,7 @@ Alexandru Ardelean
 Emmanuel Arias
 Alicia Arlen
 Jeffrey Armstrong
+Justin Turner Arthur
 Jason Asbahr
 David Ascher
 Ammar Askar