TO 5.7 COMMUNITY SERVER

DESCRIPTION:
============
8.0 clients fail to connect to 5.7 community edition
servers using SSL.

ANALYSIS:
=========
The clients fail to connect with the ssl error:
unsafe legacy renegotiation disabled. This is because,
the option SSL_OP_LEGACY_SERVER_CONNECT was cleared while
setting the ssl options.

FIX:
====
This patch reverts the changes that were added to clear
SSL_OP_LEGACY_SERVER_CONNECT option so that clients can
connect successfully to 5.7 community edition server.
This option is currently set by default in openssl
library.

RB: 21622
(cherry picked from commit a9aeb4c20b5c0cf86764c80438632419ecfd4b2c)