Add Google N2 machine types instead of just N1
N2 machine types
N2 machine types are the newest generation general-purpose machine types that offer flexible sizing between 2 to 80 vCPUs and 0.5 to 8 GB of memory per vCPU. N2 VMs run on Cascade Lake CPUs with a base frequency of 2.8 GHz and a sustained all core turbo of 3.4 GHz. These machine types also offer an overall performance improvement over N1 machine types.