Add Oxidized API URL protocol

[Zmegolaz]

file_get_contents() need the protocol ("http://" or similar) when fetching remote files, add it to the oxidized API URL config if the user forgot it.

From: https://www.reddit.com/r/LibreNMS/comments/7mrufq/i_am_a_moron_oxidized_config/

I'm not sure this is the best place to add this check, if you have any suggestion, please let me know.

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[laf]

Maybe just doing https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Form_validation for now?

Ideally longer term we'd define the config values that should exist in the db so we can validate they exist. We could also then validate the input.

[Zmegolaz]

Something like this?

[laf]

Close, config still gets updated.

This patch fixes that: https://p.libren.ms/view/raw/b0206dc8

[scrutinizer-notifier]

The inspection completed: No new issues

[laf]

Brilliant, thanks for that :) We should go back through at some point and do the same for some of the other inputs.

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