Skip backup for Linux VMs when SkipVmBackup switch is specified (Azure#3510)

* Use test extension for ADE on Linux

* Skip backup creation for Linux VMs based on switch

* Revert "Use test extension for ADE on Linux"

This reverts commit 2535c73.

* Convert to bool instead of using IsPresent

* Update help file for SkipVmBackup parameter

Author: Kamran Khan

src/ResourceManager/Compute/Commands.Compute/Extension/AzureDiskEncryption/SetAzureDiskEncryptionExtension.cs

@@ -167,6 +167,13 @@ public class SetAzureDiskEncryptionExtensionCommand : VirtualMachineExtensionBas
             HelpMessage = "Disable auto-upgrade of minor version")]
         public SwitchParameter DisableAutoUpgradeMinorVersion { get; set; }
 
+        [Parameter(
+            Mandatory = false,
+            Position = 15,
+            ValueFromPipelineByPropertyName = true,
+            HelpMessage = "Skip backup creation for Linux VMs")]
+        public SwitchParameter SkipVmBackup { get; set; }
+
         private OperatingSystemTypes? currentOSType = null;
 
         private void ValidateInputParameters()
@@ -430,7 +437,7 @@ public override void ExecuteCmdlet()
 
                     currentOSType = virtualMachineResponse.StorageProfile.OsDisk.OsType;
 
-                    if (OperatingSystemTypes.Linux.Equals(currentOSType))
+                    if (OperatingSystemTypes.Linux.Equals(currentOSType) && !SkipVmBackup)
                     {
                         CreateVMBackupForLinx();
                     }

src/ResourceManager/Compute/Commands.Compute/Microsoft.Azure.Commands.Compute.dll-Help.xml

@@ -21262,6 +21262,14 @@ PS C:\> Set-AzureRmVMDataDisk -VM $VM -Name "DataDisk01" -Caching ReadWrite |
 <maml:uri /></dev:type>
 <dev:defaultValue>False</dev:defaultValue>
 </command:parameter>
+<command:parameter required="false" variableLength="true" globbing="false" pipelineInput="True (ByPropertyName)" position="16" aliases="none"><maml:name>SkipVmBackup</maml:name>
+<maml:Description><maml:para>Skip backup creation for Linux VMs
+</maml:para>
+</maml:Description>
+<dev:type><maml:name>SwitchParameter</maml:name>
+<maml:uri /></dev:type>
+<dev:defaultValue>False</dev:defaultValue>
+</command:parameter>
 <command:parameter required="true" variableLength="true" globbing="false" pipelineInput="True (ByPropertyName)" position="2" aliases="ResourceName"><maml:name>VMName</maml:name>
 <maml:Description><maml:para>Specifies the name of the virtual machine.
 </maml:para>