pubsubpeer: keeps estabiishing connection even when node is shutting down

[vladopajic]

pubsubpeer.connectImpl keeps running and attempting to reestablish connection even when node is shutting down.

expected behavior:
all logic related to pubsub protocol should be stoppend when switch is stopped.

how to reproduce:

• run Flood publish to all peers with score above threshold, regardless of subscription test it trace debug lvl
• observer logs at the end of stdout:
  • Could not establish send connection
  • connection not found
  • Error dialing
  • etc...

note: since nodes are gracefully stopped there should be no logs of this kind