Azure matrix 1gpu

[vofish]

Add support for kubernetes_scale to 1 GPU on AKS Standard:

• Update container/kubernetes_scale/kubernetes_scale.yaml.j2 to intall the NVIDIA device plugin
• Add cloud yaml_docs manifest

Command to run:

./pkb.py --cloud=Azure --benchmarks=kubernetes_scale \
--config_override='kubernetes_scale.container_cluster.vm_spec.Azure.zone="westus2"' \
--config_override='kubernetes_scale.container_cluster.type="Kubernetes"' \
--config_override=kubernetes_scale.container_cluster.max_vm_count=4 \
--config_override='kubernetes_scale.container_cluster.vm_spec.Azure.machine_type="Standard_NC8as_T4_v3"' \
--gpu_count=1 --gpu_type=t4 \
--kubernetes_scale_num_replicas=2 --kubernetes_scale_pod_cpus=4 --kubernetes_scale_pod_memory=4G \
--kubernetes_scale_report_individual_latencies=True --kubernetes_scale_report_latency_percentiles=False \
--metadata=cloud:Azure  --timeout_minutes=236

[rsgowman]

lgtm, though let's get Zach to review too.