OR function between TLS and SSL probes

When TLS and SSL are configured in the same group, the system uses the OR mechanism instead of AND to determine the status of the real server. That is, the real server is marked as up if any one of the probes is successful.

When the SSL probing version is provided, the system uses that version to probe. When the SSL version is not specified, the behavior changes to Fallback from version SSLv3 to SSLv2. The probe starts with SSLv3. If the SSLv3 probe fails, the system probes for SSLv2.