drivers/azure/util.go
func parseVirtualNetwork(name string, defaultRG string) (string, string) {
	l := strings.SplitN(name, ":", 2)
	if len(l) == 2 {
		return l[0], l[1]
	}
	return defaultRG, name
}
func parseVirtualNetwork(name string, defaultRG string) (string, string) {
	l := strings.SplitN(name, ":", 2)
	if len(l) == 2 {
		return l[0], l[1]
	}
	return defaultRG, name
}
// parseVirtualNetwork parses Virtual Network input format "[resourcegroup:]name"
// into Resource Group (uses provided one if omitted) and Virtual Network Name