CLEARWATER CA-95669: VNCTerm to listen on just 127.0.0.1

Signed-off-by: Siddharth Vinothkumar <siddharth.vinothkumar@citrix.com>
(cherry picked from commit 4b289363c546aa02c44929815fed5968ae9c8c71)

This pull-request is a clone of https://github.com/xen-org/xen-api/pull/1042