Revert "CDRIVER-1147: Let the other end know we are about to shutdown"

This reverts commit 12120ec.

Author: ajdavis

src/mongoc/mongoc-stream-tls-openssl.c

@@ -77,9 +77,6 @@ _mongoc_stream_tls_openssl_destroy (mongoc_stream_t *stream)
 
    BSON_ASSERT (tls);
 
-   /* Attempt to be good TLS citizens and notify the other end we are shutting down */
-   BIO_ssl_shutdown (openssl->bio);
-
    BIO_free_all (openssl->bio);
    openssl->bio = NULL;