provider/azurerm: Adding data source support for Public IP

[abhijeetgaiha]

Adding data source support for azurerm_public_ip.
Resolves #15107.

Test output:

root@f75c8264f691:/go/src/github.com/hashicorp/terraform/builtin/providers/azurerm# go test -v -run ^TestAccDataSourceAzureRMPublicIP_basic$
=== RUN   TestAccDataSourceAzureRMPublicIP_basic
--- PASS: TestAccDataSourceAzureRMPublicIP_basic (85.91s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/azurerm        85.915s

[stack72]

Hi @abhijeetgaiha

This looks good to me! Thanks for the work here

% make testacc TEST=./builtin/providers/azurerm TESTARGS='-run=TestAccDataSourceAzureRMPublicIP'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/06/06 14:43:54 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/azurerm -v -run=TestAccDataSourceAzureRMPublicIP -timeout 120m
=== RUN   TestAccDataSourceAzureRMPublicIP_basic
--- PASS: TestAccDataSourceAzureRMPublicIP_basic (73.13s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/azurerm	73.148s

Paul

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