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cloud-setup: add tool for automatic IP configuration in cloud

This is a tool for automatically configuring networking in azure
cloud environment.

This add a provider implementation for Azure that when detected fetches
the private ip addressess and the subnet prefix of configured internal
load balancers.

Once this information is fetched from the metadata server, it instructs
NetworkManager to add private ip addressess and subnet prefix for each
interface detected.

It is inspired by SuSE's cloud-netconfig ([1], [2]) and Azure Instance Metadata service [3].

[1] https://www.suse.com/c/multi-nic-cloud-netconfig-ec2-azure/
[2] https://github.com/SUSE-Enceladus/cloud-netconfig
[3] https://docs.microsoft.com/en-us/azure/virtual-machines/linux/instance-metadata-service

It is also intended to work without configuration. The main point is
that you boot an image with NetworkManager and nm-cloud-setup enabled,
and it just works.