Improve unit test coverage for azure publicipclient

Author: v-xuxin

staging/src/k8s.io/legacy-cloud-providers/azure/clients/publicipclient/BUILD

@@ -29,9 +29,11 @@ go_test(
     srcs = ["azure_publicipclient_test.go"],
     embed = [":go_default_library"],
     deps = [
+        "//staging/src/k8s.io/client-go/util/flowcontrol:go_default_library",
         "//staging/src/k8s.io/legacy-cloud-providers/azure/clients:go_default_library",
         "//staging/src/k8s.io/legacy-cloud-providers/azure/clients/armclient:go_default_library",
         "//staging/src/k8s.io/legacy-cloud-providers/azure/clients/armclient/mockarmclient:go_default_library",
+        "//staging/src/k8s.io/legacy-cloud-providers/azure/retry:go_default_library",
         "//vendor/github.com/Azure/azure-sdk-for-go/services/network/mgmt/2019-06-01/network:go_default_library",
         "//vendor/github.com/Azure/go-autorest/autorest:go_default_library",
         "//vendor/github.com/Azure/go-autorest/autorest/to:go_default_library",