M5 instances don't work

[niklaas]

* aws_instance.freebsd-builder: 1 error(s) occurred:
* aws_instance.freebsd-builder: Error launching source instance: InvalidParameterCombination: Enhanced networking with the Elastic Network Adapter (ENA) is required for the 'm5.4xlarge' instance type. Ensure that you are using an AMI that i
s enabled for ENA.

It seems FreeBSD doesn't support ENA.

[sidick]

FreeBSD 11.1 upwards added support for the ena driver so it may be worth trying with newer AMIs than the defaults provided.

[niklaas]

Thanks a lot for the note! Nice to see that someone took a look at these scripts. :-)

I haven't been using the port-builder myself for quite some time. Thus, most probably I won't improve it in short term perspective. That said, I'll keep this in mind and update the AMIs the next time I use it.

Feel free to issue a pull request, if you want to, though!