Add "legacy" tls policy to /account and /connect commands. When this
policy is specified the connection is connected with
XMPP_CONN_LEGACY_SSL flag. Notice, legacy SSL and STARTTLS are not
compatible and user has to know when exactly the new policy should be
used.
To enable it, run one of the next commands:
/connect <jid> tls legacy [server <host>]
/account <name> set tls legacy
Notice, there is no SRV record for legacy SSL. Therefore, you may need
"server" property to connect successfully. Refer to configuration
provided by your server.
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