Revert "dom0/qvm-prefs: remove duplicated set_include_in_backups"

This reverts commit aa99c411db.
This wasn't duplicated...

Conflicts:

	dom0/qvm-tools/qvm-prefs

dom0/qvm-tools/qvm-prefs

@@ -283,6 +283,15 @@ def set_debug(vms, vm, args):
         vm.debug = False
     else:
         vm.debug = bool(eval(args[0].capitalize()))
+
+    return True
+
+def set_include_in_backups(vms, vm, args):
+    if len (args) != 1:
+        print >> sys.stderr, "Missing value (True/False)!"
+        return False
+
+    vm.include_in_backups = bool(eval(args[0].capitalize()))
     return True
 
 properties = {