Create a GPU based ABM cluster and install CUDA drivers during Terraform initialization

[puneith]

We need to create a Terraform based ABM cluster setup [1] using GPU on Google Compute Engine. We've made upstream contribution to the Google Terraform Provider for GPU support [2] in the instance_template module release [3]. We need to perform few things --

• Provide a config based sample for GPU hardware enabled ABM (anthos-samples repo)
• Install NVIDIA CUDA drivers on ABM cluster (anthos-samples repo)
• Create a setup guide in this repo on how to create the ABM GPU cluster

[1] https://github.com/GoogleCloudPlatform/anthos-samples/tree/master/anthos-bm-gcp-terraform
[2] terraform-google-modules/terraform-google-vm#160
[3] terraform-google-modules/terraform-google-vm#158

[puneith]

GoogleCloudPlatform/anthos-samples#68