Provide support for different cpu types and hardware accelerators

[kkasravi]

kfctl provides a fixed configuration for gpu's when using gcp under $KFAPP/gcp_config but doesn't provide for variations in the machineType, cpuType (Broadwell, Skylake), imageType (cos or ubuntu) or alternate accelerators as discussed here

There should be a generic way to add these resources to a cluster based on the cloud provider, perhaps in manifests