Fix reconnect logging and memleak

[MichalCz]

What?

• Fix the logging levels on reconnect from the runner
• Unhook streams before reconnecting an instance

Why?

Currently a reconnect causes a double call to hookupStreams which pipes multiple streams to the input. This unhooks the streams on reconnect, so there are no extra listeners and we're not causing a refleak.

This only happens when a sequence stream errors out.

Additionally stream connect and reconnect errors are muted while connecting and logging happens only on disconnection.

Reproduce:

• Create an instance that sends an error on output (out.emit("error", new Error()))
• Observe the chain of reconnects

Review checks:

These aspects need to be checked by the reviewer:

• [ ] Verify and confirm operation (please post a screenshot)
• [ ] All STH tests pass
• [ ] All Scramjet Cloud Platform tests pass
• [ ] Documentation is updated or no changes