Add support installation from cached livecd

pym/cl_fill_install.py

@@ -513,6 +513,8 @@ class fillVars(object, glob_attr):
         if self.Get('os_root_type') == "livecd":
             if self.Get('os_scratch') == "on":
                 livedistr = ['/mnt/flash']
+            elif path.exists('/mnt/squash'):
+                livedistr = ['/mnt/livecd']
             else:
                 livedistr = ['/mnt/cdrom']
         else: