Add support for labels and tags on GKE node_config

[unguiculus]

No description provided.

[danawillow]

Looks good! Mind updating the docs too? https://github.com/terraform-providers/terraform-provider-google/blob/master/website/docs/r/container_cluster.html.markdown

TF_ACC=1 go test ./google -v -run=TestAccContainerCluster_withNodeConfig -timeout 120m
=== RUN   TestAccContainerCluster_withNodeConfig
--- PASS: TestAccContainerCluster_withNodeConfig (296.10s)

TF_ACC=1 go test ./google -v -run=TestAccContainerCluster_basic -timeout 120m
=== RUN   TestAccContainerCluster_basic
--- PASS: TestAccContainerCluster_basic (265.57s)
PASS

[unguiculus]

@danawillow Updated docs.

[danawillow]

LGTM, thanks @unguiculus!

[ghost]

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