CLI commands for LKE

Lists current Kubernetes clusters available on your account:
```
linode-cli lke clusters-list
```

Create a Kubernetes cluster. The system creates the cluster asynchronously. You can use the events system to determine when the cluster is ready to use:

linode-cli lke cluster-create \
  --label cluster12345 \
  --region us-central \
  --k8s_version 1.16 \
  --node_pools.type g6-standard-4 --node_pools.count 6 \
  --node_pools.type g6-standard-8 --node_pools.count 3 \
  --tags ecomm

Update a Kubernetes cluster:

linode-cli lke cluster-update $cluster_id \
  --label lkecluster54321 \
  --tags ecomm \
  --tags blog \
  --tags prod \
  --tags monitoring

Delete a cluster you have permission to read_write:
```
linode-cli lke cluster-delete $cluster_id
```
List all active node pools on a Kubernetes cluster:
```
linode-cli lke pools-list $cluster_id
```

Create a node pool on a Kubernetes cluster:

linode-cli lke pool-create $cluster_id \
  --type g6-standard-4 \
  --count 6

Update a node pool in a Kubernetes cluster. When a node pool's count is changed, the system replaces the nodes in that pool in a rolling fashion.
```
linode-cli lke pool-update $cluster_id $pool_id \
  --count 6
```

Delete a node pool from a Kubernetes cluster:

linode-cli lke pool-delete $cluster_id $pool_id

View the Kubeconfig file for the Kubernetes cluster:
```
linode-cli lke kubeconfig-view $cluster_id
```

Other actions are available. Use linode-cli lke --help for a complete list.