CA-95669: VNC/VNCTerm should listen on localhost only (127.0.0.1)

(The commit from Feb/March 2013 didn't fix this.)

This only fixes the problem for guest domains, not for dom0.

The dom0 vncterm is run from /etc/inittab so we shall need to
change the repository that adds the relevant line to that file.

Signed-off-by: Thomas Sanders <thomas.sanders@citrix.com>