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Cloud-init in environments where Meta-data is available via network configures
the main interface and keeps the config in `/etc/network/interfaces.d/`.
This config later interferes with the VyOS configuration.
To avoid the problem previously the code in the `cc_vyos.py` module was used,
but this is not enough. The module is running only once during instance
deployment. But Cloud-init will re-add the config file with each boot.
There are two ways to solve this incompatibility (within Cloud-init) - disable
network config or perform cleanup during each boot.
Disabling network config is not correct in this context, because it blocks the
ability to fetch Meta-data after the first boot, which in turn blocks the
ability to run per-boot modules with an updated config.
Therefore, the cleanup code was extracted to an independent
`cc_vyos_ifupdown.py` module that performs proper cleanup with each boot.
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