[virt-tools-list] [PATCH] Deprecated GtkVBox and GtkHBox

[rstoyanov1 at gmail.com]

 Problem:
    - GtkHBox and GtkVBox have been deprecated since version 3.2 and should not be used in newly-written code.
     
 Solution: Replace GtkHBox and GtkVBox with GtkBox. 
    - I have used the find function in text-editor to find all occurances of "GtkVBox" and "GtkHBox" then replaced them with "GtkBox".
    - Then append on a new line immediately after "<property name="orientation">...</property>" with value "horizontal" or "vertical" accordingly.