Merge #22215: have the smtplib 'quit' command reset the state.

Lib/smtplib.py

@@ -891,6 +891,10 @@ class SMTP:
     def quit(self):
         """Terminate the SMTP session."""
         res = self.docmd("quit")
+        # A new EHLO is required after reconnecting with connect()
+        self.ehlo_resp = self.helo_resp = None
+        self.esmtp_features = {}
+        self.does_esmtp = False
         self.close()
         return res