func randomAzureStorageAccountName() string {
	const (
		maxLen = 24
		chars  = "0123456789abcdefghijklmnopqrstuvwxyz"
	)
	return storageAccountPrefix + randomString(maxLen-len(storageAccountPrefix), chars)
}
func randomAzureStorageAccountName() string {
	const (
		maxLen = 24
		chars  = "0123456789abcdefghijklmnopqrstuvwxyz"
	)
	return storageAccountPrefix + randomString(maxLen-len(storageAccountPrefix), chars)
}
/* Utilities */
// randomAzureStorageAccountName generates a valid storage account name prefixed
// with a predefined string. Availability of the name is not checked. Uses maximum
// length to maximise randomness.