The ipv6 address was not set up before 'slapos format' needed it, so it always failed

Contributed by Kristopher Ruzic (kristopher.ruzic@nexedi.com)

Now 'upgrader' should do also date comparation.

 In this way we can reuse the same roles for upgrade

 Install folder is exposed via a http server, so include an simple index.html.

This is unused code, preserved here for reference with kiwi procedure for default vifib server.

Restrict upgrade egg from a safe hardcoded source only