make apt-p2p default

[sandyd]

I heard that the ubuntu servers are sometimes overloaded because of the number of users downloading from it.

so why don't we expand on the current apt-p2p framework so that it is used by default. If the apt-p2p framework can't find any peers after a certain amount of time, it can then switch over to another server. This way, we can use less server resources.

[CharmyBee]

That would be bad and not sit well with certain ISPs. Not every ISP is liberal about the P2P traffic.

[Chronon]

I like the idea, but maybe not make it default.