Incorporate ENA Express recommended settings

[nmeyerhans]

https://github.com/amzn/amzn-ec2-ena-utilities/blob/main/ena-express/check-ena-express-settings.sh adjusts a number of tuning parameters at various layers of the network stack, including the ENA driver level. We should evaluate which, if any, of those parameters should be set by default in ec2-net-utils.

[ziggythehamster]

I don't know if Amazon Linux ships TuneD, but that script could be turned into a TuneD profile if so. We have a rather simple RPM that installs our own TuneD profile that currently only sets vm.min_free_kbytes for ENA, but we could work together on open-sourcing a more general RPM like tuned-profile-amazon-ec2 based on it if you're interested. (I also am adding this to my queue to implement, so it may be "take code I already wrote and pop it on GitHub" depending on timing.)

Hit me up on-corp if you want to chat about it or see our existing code.