The script ss_fping.php should timeout based upon the actual device if it's searchable

[TheWitness]

Feature Request

Is your feature request related to a problem? Please describe

We received a report the ss_fping.php was not working, it turns out it was using the systems default timeout, which for the user that was about 400ms. However, the network was Satellite based which requires a greater timeout to be effective. The user increased the default timeout and that was fine, but it would be good to be able to extract the actual timeout setting for the device, if it's discoverable.

Describe the solution you'd like

For the ping IP, check the Cacti database and use it's ping timeout vs. the system default.