Add LocationCompleter to ServerManagement cmdlets

Author: azdevxps

src/ResourceManager/ServerManagement/Commands.ServerManagement/Commands/Gateway/NewServerMangementGatewayCmdlet.cs

@@ -37,6 +37,7 @@ public class NewServerManagementGatewayCmdlet : ServerManagementCmdlet
 
         [Parameter(Mandatory = true, HelpMessage = "The resource group location.",
             ValueFromPipelineByPropertyName = true, Position = 2)]
+        [LocationCompleter("Microsoft.ServerManagement/gateways")]
         [ValidateNotNullOrEmpty]
         public string Location { get; set; }
 

src/ResourceManager/ServerManagement/Commands.ServerManagement/Commands/Node/NewServerMangementNodeCmdlet.cs

@@ -37,6 +37,7 @@ public class NewServerManagementNodeCmdlet : ServerManagementCmdlet
 
         [Parameter(Mandatory = true, HelpMessage = "The resource group location.",
             ValueFromPipelineByPropertyName = true, ParameterSetName = "ByName", Position = 2)]
+        [LocationCompleter("Microsoft.ServerManagement/nodes")]
         [ValidateNotNullOrEmpty]
         public string Location { get; set; }