dhcpv6: always trigger script update in case of IA updates
Trigger a script update when IAs have been updated during a reply in reponse
to to either a renew/rebind.
This will make sure new IAs assigned by the DHCPv6 server are published via
a script update.
This covers the following scenario:
-Prefix A is assigned by DHCPv6 server
-Prefix A is renewed but the DHCPv6 server does not include prefix A in
the reply but assigns a new prefix B.
-Prefix B is published via the update script while renews for prefix A
will still be sent
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>