This directory used to contain ready-to-use Gentoo stages for Linux-VServer. They can now be found at http://bb.xnull.de/projects/gentoo/.
To build a new guest with one of these stages use a command similar to the following (requires util-vserver-0.30.213 or later):
vserver myguest build \
-m template \
--context 123 \
--hostname myguest \
--interface eth0:192.168.0.123/24 \
--initstyle gentoo \
-- \
-d gentoo \
-t /path/to/gentoo-vserver-$ARCH-$VERSION.tar.bz2