IsWindows property added to the VM class.

Returns true if this VM is Windows.

Ignore PV guests, then check if viridian platform property is set.
This is based on the assumption that the viridian flag is always true for a windows VM.

Signed-off-by: Gabor Apati-Nagy <gabor.apati-nagy@citrix.com>

XenModel/XenAPI-Extensions/VM.cs

@@ -1838,6 +1838,18 @@ namespace XenAPI
                 return false;
             }
         }
+
+        /// <summary>
+        /// Returns true if this VM is Windows.
+        /// </summary>
+        public bool IsWindows
+        {
+            get
+            {
+                return 
+                    this.IsHVM && BoolKey(this.platform, "viridian");
+            }
+        }
     }
 
     public struct VMStartupOptions