(FACT-1847) Fix cloud fact implementation for Azure #2302
Merged
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Since we now have an az_metadata fact, we can reimplement the cloud fact using this. The previous implementation was Linux-only and worked by searching for a specific string in the DHCP lease file, which does not work anymore (at least not on Ubuntu 20.04 Azure VMs).
For the new implemetation, extract the cloud fact into its own resolver, as it indirectly depends on the virtual fact which is also part of the virtualization resolver. The new implementation should work regardless of OS, as it just checks for the existence of the az_metadata fact.