Future: Optimise amount of connections from client to server/scheduler

[gww-parity]

As client is swapn by Cargo for each Rustc invocation,
it generates a lot of parallel instances of client, each may want to have connection to scheduler/server.

In case of remote setup with encrypted connections it may be not optimal.

Instead we would like some local proxy , to which clients are connecting, that multiplex connections to remote server/scheduler - that way to reduce overhead of creation of encrypted connections.