Support for the stable scopes

[sandhose]

• data-model: make the device emit both stable and unstable scope tokens
• Make the introspection endpoint normalise stable and unstable scopes
• storage: get both the stable & unstable scopes when looking for devices
• Make the frontend parse the stable scope as well
• Allow the stable scope in the policy
• Parse the stable scopes in the templates
• Mention the stable scopes in the doc, remove the guest scope
• Update the admin API doc to use stable scope in the example

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