Alvaro Hernandez authored Dec 28, 2020 and Alvaro Hernandez committed Dec 29, 2020

Source code for new blog post about automating creation of EKS clusters
on VMs created by Firecracker. It's part II of the
202012-firecracker_cloud_image_automation post.

Basically, add ansible code to automate installation and configuration
of EKS (based on Ubuntu's snap-based EKS-D) on the created VMs.
Interestingly, ansible hosts.yaml inventory file is generated
dynamically by 05-install_eks_via_ansible.sh, which adds the hosts based
on the configuration (file `variables`) as well as dynamic tokens, that
are random 32-byte character strings required by EKS per host.

Minor improvements to the VM creation:
* unhardcoding VM CPU and RAM
* parallel VM creation
* fixed-length instance identifiers

Signed-off-by: Alvaro Hernandez <aht@ongres.com>