Use kid as args for the kms plugin

[aramase]

Instead of getting the key vault name, key name and key version in 3 separate flags, we can get that information with --kid

kubernetes-kms/cmd/server/main.go

Lines 33 to 35 in 962eaf1

	keyvaultName = flag.String("keyvault-name", "", "Azure Key Vault name")
	keyName = flag.String("key-name", "", "Azure Key Vault KMS key name")
	keyVersion = flag.String("key-version", "", "Azure Key Vault KMS key version")

Example kid https://kindkv.vault.azure.net/keys/k8s/cfde4c4930bd418c8638458890c4cd7b. We can get the keyvault name, resource identifier, key name and version from this kid.