user-accounts: Display the username in list

* By displaying the username we get the unix user name for
   local accounts, and the full login name for remote accounts.
 * Can now differentiate between accounts with the same display
   'real' name.
 * Can see the full login identity of remote accounts.

https://bugzilla.gnome.org/show_bug.cgi?id=681767

panels/user-accounts/um-user-panel.c

@@ -116,7 +116,7 @@ get_name_col_str (UmUser *user)
 {
         return g_markup_printf_escaped ("<b>%s</b>\n<small>%s</small>",
                                         um_user_get_display_name (user),
-                                        um_account_type_get_name (um_user_get_account_type (user)));
+                                        um_user_get_user_name (user));
 }
 
 static void