ENI Hotplugging, etc.
ENI Hotplug / udhcpc script
- works with all Alpine versions back to 3.9
- udhcpc handles ENI's primary IPv4
- post-bound/post-renews eth-eni-hook handles secondary IPv4 & IPv6 addresses, route tables, and rules
setup-ami tweaks
- move scripts to be installed into setup-ami.d/
- move config snippets into setup-ami.d/etc/ (previously embedded in setup-ami)
resolves #82 (closed), #70 (closed)