Send the instance ID in the token for Azure

[jesusbv]

Description

When activating an extension, i.e. LTSS in Azure,
the header must contain the the instance identifier

This Fixes bsc#1233314

• Related Issue / Ticket / Trello card: https://bugzilla.suse.com/show_bug.cgi?id=1233314

How to test

on Azure, registering LTSS extension should work

Change Type

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• Bug Fix (a non-breaking change which fixes an issue)
• New Feature (a non-breaking change which adds new functionality)
• Documentation Update (a change which only updates documentation)

Checklist

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• I have documented the MANUAL.md file with any changes to the user experience.
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