Allow specifying accelerators in cluster node_config (hashicorp#1115)

Author: dhague

Diff for: docs/r/container_cluster.html.markdown

@@ -235,6 +235,9 @@ The `node_config` block supports:
 * `disk_size_gb` - (Optional) Size of the disk attached to each node, specified
     in GB. The smallest allowed disk size is 10GB. Defaults to 100GB.
 
+* `guest_accelerator` - (Optional) List of the type and count of accelerator cards attached to the instance. 
+    Structure documented below.
+
 * `image_type` - (Optional) The image type to use for this node.
 
 * `labels` - (Optional) The Kubernetes labels (key/value pairs) to be applied to each node.
@@ -276,6 +279,12 @@ The `node_config` block supports:
 * `tags` - (Optional) The list of instance tags applied to all nodes. Tags are used to identify
     valid sources or targets for network firewalls.
 
+The `guest_accelerator` block supports:
+
+* `type` (Required) - The accelerator type resource to expose to this instance. E.g. `nvidia-tesla-k80`.
+
+* `count` (Required) - The number of the guest accelerator cards exposed to this instance.
+
 ## Attributes Reference
 
 In addition to the arguments listed above, the following computed attributes are

Diff for: docs/r/container_node_pool.html.markdown

@@ -45,6 +45,10 @@ resource "google_container_cluster" "primary" {
       "https://www.googleapis.com/auth/logging.write",
       "https://www.googleapis.com/auth/monitoring",
     ]
+    guest_accelerator = [{
+      type="nvidia-tesla-k80"
+      count=1
+    }]
   }
 }
 ```