test: Update Socket.io target
test: Update Socket.io target

- Make it requireable
- Replace console.logs with debugs
- Send a "hello" message when a new client connects

hassy/artillery-core,shoreditch-ops/artillery-core,erikerikson/artillery-core,hassy/artillery,hassy/artillery,shoreditch-ops/artillery,shoreditch-ops/artillery,hassy/artillery,shoreditch-ops/artillery,shoreditch-ops/artillery-core,hassy/artillery-core,erikerikson/artillery-core