provider/kubernetes: Add support for Service

[radeksimko]

Test plan

make testacc TEST=./builtin/providers/kubernetes TESTARGS='-run=TestAccKubernetesService_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/05/16 19:10:39 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/kubernetes -v -run=TestAccKubernetesService_ -timeout 120m
=== RUN   TestAccKubernetesService_basic
--- PASS: TestAccKubernetesService_basic (15.47s)
=== RUN   TestAccKubernetesService_loadBalancer
--- PASS: TestAccKubernetesService_loadBalancer (10.18s)
=== RUN   TestAccKubernetesService_nodePort
--- PASS: TestAccKubernetesService_nodePort (4.32s)
=== RUN   TestAccKubernetesService_importBasic
--- PASS: TestAccKubernetesService_importBasic (7.11s)
=== RUN   TestAccKubernetesService_generatedName
--- PASS: TestAccKubernetesService_generatedName (11.12s)
=== RUN   TestAccKubernetesService_importGeneratedName
--- PASS: TestAccKubernetesService_importGeneratedName (5.59s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/kubernetes	53.874s

[grubernaut]

LGTM

[ghost]

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