Remove handlers and stop processes when leaving a shard

[adlrocha]

When leaving a shard we must:

• Remove exchange and hello handlers for the shard if we no longer need them (i.e. we don't want to sync with the chain).

  • eudico/chain/sharding/exchange.go

    Line 55 in ea618e3

    sh.host.SetStreamHandler(protocol.ID(HelloProtoPrefix+sh.netName), sh.handleHelloStream)

  • eudico/chain/sharding/exchange.go

    Line 78 in ea618e3

    sh.host.SetStreamHandler(protocol.ID(BlockSyncProtoPrefix+sh.netName), srv.HandleStream)

• Remove all shard-related processes

  • Stop syncer
  • Stop sync manager
  • Stop mining (if we are still mining)
  • Close pubsub topics
  • etc. (I may be missing things, this will require a walk through all the code).