public static VirtualMachineExtensionImageContext GetAzureVMExtenionInfo(string extensionName)
        {
            List <VirtualMachineExtensionImageContext> extensionInfo = new List <VirtualMachineExtensionImageContext>();

            extensionInfo.AddRange(vmPowershellCmdlets.GetAzureVMAvailableExtension());
            return(extensionInfo.Find(c => c.ExtensionName.Equals(extensionName)));
        }