grub output to serial console, system console output to aws system log

[jonathanspw]

This will improve user experience on AWS, especially when it comes to troubleshooting.

Ref https://aws.amazon.com/blogs/compute/using-ec2-serial-console-to-access-the-grub-menu-and-recover-from-boot-failures/

[LKHN]

I would suggest to close it because of:

• To make this changes effective; to see the the GRUB menu on EC2 Serial Console, We need to increment the values of GRUB_TIMEOUT higher than 0 in seconds. Which affects the boot time of the instances.
• Since the EC2 Serial Console is only supported on the instances which is powered by Nitro (KVM) based instances. Xen type of instances will have longer boot time for no practical gain.
• I haven't came across with any AMIs which has this options defined by default. Also haven't seen any demand by the community too.

Another reason is #171 which did the major changes to the code base.