autoscaling script doesn't support Nitro instance types - nvme devices

[Iliabuleh]

Hey Guys,

We noticed when moving to the Nitro instance types (r5, m5 etc), which are using the /dev/nvme.. device names - it doesn't work.
script is looking for /dev/xvd{a,b..} device naming convention which is suitable with the previous r4,m4.. types.

Having the Nitro device convention supported in this tool would be great.

Thanks !