fix ftplib resource warnings

Lib/ftplib.py

@@ -361,6 +361,7 @@ class FTP:
             conn, sockaddr = sock.accept()
             if self.timeout is not _GLOBAL_DEFAULT_TIMEOUT:
                 conn.settimeout(self.timeout)
+            sock.close()
         if resp[:3] == '150':
             # this is conditional in case we received a 125
             size = parse150(resp)

Lib/test/test_ftplib.py

@@ -355,6 +355,8 @@ if ssl is not None:
             if (isinstance(self.socket, ssl.SSLSocket) and
                 self.socket._sslobj is not None):
                 self._do_ssl_shutdown()
+            else:
+                super(SSLConnection, self).close()
 
 
     class DummyTLS_DTPHandler(SSLConnection, DummyDTPHandler):