Update Get azure DSC extension status to use base cmdlet to get deployment

Author: TravisEz13

src/ServiceManagement/Compute/Commands.ServiceManagement/IaaS/Extensions/DSC/GetAzureVMDscExtensionStatus.cs

@@ -83,7 +83,6 @@ public class GetAzureVmDscExtensionStatusCommand : IaaSDeploymentManagementCmdle
         protected const string GetStatusByServiceAndVmNameParamSet = "GetStatusByServiceAndVMName";
         protected const string GetStatusByVmParamSet = "GetStatusByVM";
 
-        internal string Service;
         internal string VmName;
 
         /// <summary>
@@ -94,6 +93,7 @@ protected override void ExecuteCommand()
         {
             ServiceManagementProfile.Initialize();
             GetService(ServiceName, VM);
+
             base.ExecuteCommand();
 
             if (CurrentDeploymentNewSM == null)
@@ -118,7 +118,7 @@ internal void GetService(String serviceName, IPersistentVM vm)
         {
             if (!string.IsNullOrEmpty(serviceName))
             {
-                Service = serviceName;
+                this.ServiceName = serviceName;
             }
             else
             {
@@ -127,7 +127,7 @@ internal void GetService(String serviceName, IPersistentVM vm)
                 if (vmRoleContext == null)
                     return;
 
-                Service = vmRoleContext.ServiceName;
+                this.ServiceName = vmRoleContext.ServiceName;
                 VmName = vmRoleContext.Name;
             }
         }