Treat 503 as an expected authentication response

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This avoids spamming error reports on a 503 and instead uses the auth failure delay mechanism which will reduce the load we create on the API and also on openvpn from reconnect attempts and help reduce subsequent 503s and other slowness

Change-type: patch

Change-type: major|minor|patch
Connects-to: #
See:
Depends-on:

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Contributor checklist

• Build output has been rebuilt and tested
• Introduces security considerations
• Tests are included
• Documentation is added or changed
• Affects the development, build or deployment processes of the component

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stale