Fix running from another directory
Gentoo template, first version

There is still missing IPv6 default route after each boot. For IPv6 to work,
iproute2 have to be emerged. and route have to be set outside obvious
/etc/conf.d/net where it would be overwritten on next container start.
Proper IPv6 support for Gentoo

Build iproute2 during bootstraping
Add missing venet0 ipv6 route using postup function