Make chutney use sockets rather than ports

I often want to run multiple chutney networks at once. One way of doing this is to use unix sockets at unique paths.

And we should do this anyway to test the unix socket code.

added component::core tor/chutney priority::medium severity::normal status::new type::enhancement labels

Disowning tickets I don't intend to work on in the next 6 months.

Trac:
Owner: teor to N/A
Status: new to assigned

Mark all tickets that are assigned to nobody as "new".

Trac:
Status: assigned to new

moved to tpo/core/chutney#21544 (closed)