fix: ensure eth0 addr is set to NIC's primary addr #39
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Reason for Change:
Fix an issue where multi-master clusters provision fails if distro is set to
ubuntu-18orubuntu-20.04, and network plugin is set toazure.Cloud-init network configuration does not set eth0's address to the NIC's primary address. This breaks the etcd cluster as the cluster members do not trust requests from unexpected sources.