test-bot: don't try to retap TapDependency taps.
vpcs 0.6 new formula

Project description:
The VPCS can simulate up to 9 PCs. You can ping/traceroute them, or
ping/traceroute the other hosts/routers from the virtual PCs when you
study the Cisco routers in the Dynamips. VPCS is not the traditional PC,
it is just a program running on the Linux or Windows, and only few
network commands can be used in it. But VPCS can give you a big hand
when you study the Cisco devices in the Dynamips. VPCS can replace the
routers or VMware boxes which are used as PCs in the Dynamips network.
vpcs: add 0.6 bottle.