kubernetes: Add config_map resource

[radeksimko]

Test plan

make testacc TEST=./builtin/providers/kubernetes TESTARGS='-run=TestAccKubernetesConfigMap'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/16 07:44:43 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/kubernetes -v -run=TestAccKubernetesConfigMap -timeout 120m
=== RUN   TestAccKubernetesConfigMap_basic
--- PASS: TestAccKubernetesConfigMap_basic (5.03s)
=== RUN   TestAccKubernetesConfigMap_importBasic
--- PASS: TestAccKubernetesConfigMap_importBasic (2.62s)
=== RUN   TestAccKubernetesConfigMap_generatedName
--- PASS: TestAccKubernetesConfigMap_generatedName (1.69s)
=== RUN   TestAccKubernetesConfigMap_importGeneratedName
--- PASS: TestAccKubernetesConfigMap_importGeneratedName (1.51s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/kubernetes	10.934s

[catsby]

👍

[ghost]

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