Enrich the unit tests for azure vmsizeclient and snapshotclient and subnetclient

Author: v-xuxin

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

@@ -29,9 +29,11 @@ go_test(
     srcs = ["azure_snapshotclient_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/compute/mgmt/2019-12-01/compute:go_default_library",
         "//vendor/github.com/Azure/go-autorest/autorest:go_default_library",
         "//vendor/github.com/Azure/go-autorest/autorest/to:go_default_library",