setup: updated answer file

updated answer file for avoiding prompt:
[ INFO  ] Stage: Setup validation
          Generated iptables rules are different from current ones.
          Do you want to review them? (Yes, No) [No]:

Change-Id: Ie458dfeb79ab1f00d4435191de4e41931dde7e82
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>