provider/kubernetes: Add support for persistent_volume_claim

[radeksimko]

Test plan

make testacc TEST=./builtin/providers/kubernetes TESTARGS='-run=TestAccKubernetesPersistentVolumeClaim_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/04/11 08:29:55 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/kubernetes -v -run=TestAccKubernetesPersistentVolumeClaim_ -timeout 120m
=== RUN   TestAccKubernetesPersistentVolumeClaim_basic
--- PASS: TestAccKubernetesPersistentVolumeClaim_basic (3.27s)
=== RUN   TestAccKubernetesPersistentVolumeClaim_importBasic
--- PASS: TestAccKubernetesPersistentVolumeClaim_importBasic (4.17s)
=== RUN   TestAccKubernetesPersistentVolumeClaim_volumeMatch
--- PASS: TestAccKubernetesPersistentVolumeClaim_volumeMatch (22.80s)
=== RUN   TestAccKubernetesPersistentVolumeClaim_labelsMatch
--- PASS: TestAccKubernetesPersistentVolumeClaim_labelsMatch (11.06s)
=== RUN   TestAccKubernetesPersistentVolumeClaim_labelsMatchExpression
--- PASS: TestAccKubernetesPersistentVolumeClaim_labelsMatchExpression (3.07s)
=== RUN   TestAccKubernetesPersistentVolumeClaim_volumeUpdate
--- PASS: TestAccKubernetesPersistentVolumeClaim_volumeUpdate (15.05s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/kubernetes	59.511s

[grubernaut]

LGTM, mind formatting documentation examples with 2 spaces, and using the new hcl tag for the code block?

[radeksimko]

Updated, thanks for the catch, I will merge it on green.

[ghost]

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