Break trunk by removing twisted

This patch switches from the twisted usage for inter-node protocol to
simple BaseHTTPServer/httplib. The patch has more deletions because we
use no authentication, no encryption at all.

As such, this is just for trunk, and only for testing. What it brings is
the ability to use the rpc library from within multiple threads in
parallel (or it should so).

Since the changes are very few and non-intrusive, they can be reverted
without impacting the rest of the code.

This passes burnin. QA was not tested.

Reviewed-by: imsnah