Warn users of upcoming Tag behavior changes in ARM cmdlets

Author: vivsriaus

src/ResourceManager/Resources/Commands.ResourceManager/Cmdlets/Implementation/FindAzureResourceGroupCmdlet.cs

@@ -48,6 +48,8 @@ protected override void OnEndProcessing()
         /// </summary>
         private void RunCmdlet()
         {
+            this.WriteWarning("The usability of Tag parameter in this cmdlet will be modified in a future release. This will impact creating, updating and appending tags for Azure resources. For more details about the change, please visit https://github.com/Azure/azure-powershell/issues/726#issuecomment-213545494");
+
             PaginatedResponseHelper.ForEach(
                getFirstPage: () => this.GetResourceGroups(),
                getNextPage: nextLink => this.GetNextLink<JObject>(nextLink),

src/ResourceManager/Resources/Commands.ResourceManager/Cmdlets/Implementation/Resource/FindAzureResourceCmdlet.cs

@@ -149,6 +149,7 @@ public sealed class FindAzureResourceCmdlet : ResourceManagerCmdletBase
         protected override void OnProcessRecord()
         {
             base.OnProcessRecord();
+            this.WriteWarning("The usability of TagName and TagValue parameters in this cmdlet will be modified in a future release. This will impact creating, updating and appending tags for Azure resources. For more details about the change, please visit https://github.com/Azure/azure-powershell/issues/726#issuecomment-213545494");
         }
 
         /// <summary>

src/ResourceManager/Resources/Commands.ResourceManager/Cmdlets/Implementation/Resource/NewAzureResourceCmdlet.cs

@@ -87,6 +87,7 @@ public sealed class NewAzureResourceCmdlet : ResourceManipulationCmdletBase
         protected override void OnProcessRecord()
         {
             base.OnProcessRecord();
+            this.WriteWarning("The usability of Tag parameter in this cmdlet will be modified in a future release. This will impact creating, updating and appending tags for Azure resources. For more details about the change, please visit https://github.com/Azure/azure-powershell/issues/726#issuecomment-213545494");
 
             var resourceId = this.GetResourceId();
             this.ConfirmAction(

src/ResourceManager/Resources/Commands.ResourceManager/Cmdlets/Implementation/Resource/SetAzureResourceCmdlet.cs

@@ -84,7 +84,7 @@ protected override void OnProcessRecord()
 
             if(!string.IsNullOrEmpty(this.ODataQuery))
             {
-                this.WriteWarning("The ODataQuery parameter is being deprecated in Set-AzureRmResource cmdlet and will be removed in a future release.");
+                this.WriteWarning("The ODataQuery parameter is being deprecated in Set-AzureRmResource cmdlet and will be removed in a future release. Also, the usability of Tag parameter in this cmdlet will be modified in a future release. This will impact creating, updating and appending tags for Azure resources. For more details about the change, please visit https://github.com/Azure/azure-powershell/issues/726#issuecomment-213545494");
             }
 
             var resourceId = this.GetResourceId();

src/ResourceManager/Resources/Commands.Resources/ResourceGroups/NewAzureResourceGroupCommand.cs

@@ -44,7 +44,7 @@ public class NewAzureResourceGroupCommand : ResourcesBaseCmdlet
 
         public override void ExecuteCmdlet()
         {
-            WriteWarning("The output object type of this cmdlet will be modified in a future release.");
+            WriteWarning("The output object type of this cmdlet will be modified in a future release. Also, the usability of Tag parameter in this cmdlet will be modified in a future release. This will impact creating, updating and appending tags for Azure resources. For more details about the change, please visit https://github.com/Azure/azure-powershell/issues/726#issuecomment-213545494");
             CreatePSResourceGroupParameters parameters = new CreatePSResourceGroupParameters
             {
                 ResourceGroupName = Name,

src/ResourceManager/Resources/Commands.Resources/ResourceGroups/SetAzureResourceGroupCommand.cs

@@ -52,7 +52,7 @@ public class SetAzureResourceGroupCommand : ResourcesBaseCmdlet
 
         public override void ExecuteCmdlet()
         {
-            WriteWarning("The output object type of this cmdlet will be modified in a future release.");
+            WriteWarning("The output object type of this cmdlet will be modified in a future release. Also, the usability of Tag parameter in this cmdlet will be modified in a future release. This will impact creating, updating and appending tags for Azure resources. For more details about the change, please visit https://github.com/Azure/azure-powershell/issues/726#issuecomment-213545494");
             UpdatePSResourceGroupParameters parameters = new UpdatePSResourceGroupParameters
             {
                 ResourceGroupName = Name ?? ResourceIdentifier.FromResourceGroupIdentifier(this.Id).ResourceGroupName,