Duo support

[viclou]

Expected Behavior (or desired behavior if a feature request)

Is it possible to use SAML with the hosted version version of snipeIT? If not, is it possible to protect this application with Duo?

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Actual Behavior

(what actually happens goes here)

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Please confirm you have done the following before posting your bug report:

• I have enabled debug mode
• I have read checked the Common Issues page

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Please provide answers to these questions before posting your bug report:

• Version of Snipe-IT you're running
• What OS and web server you're running Snipe-IT on
• What method you used to install Snipe-IT (install.sh, manual installation, docker, etc)
• WITH DEBUG TURNED ON, if you're getting an error in your browser, include that error
• What specific Snipe-IT page you're on, and what specific element you're interacting with to trigger the error
• If a stacktrace is provided in the error, include that too.
• Any errors that appear in your browser's error console.
• Confirm whether the error is reproduceable on the demo.
• Include any additional information you can find in app/storage/logs and your webserver's logs.
• Include what you've done so far in the installation, and if you got any error messages along the way.
• Indicate whether or not you've manually edited any data directly in the database

[snipe]

Duo/SAML is not currently available. Closing as duplicate of #542.