Commits on Sep 22, 2020

1. Always remove the right listener from the hub …

   When in hubs.trampoline(fd, ...), a greenthread registers itself as a
   listener for fd, switches to the hub, and then calls
   hub.remove(listener) to deregister itself. hub.remove(listener)
   removes the primary listener. If the greenthread awoke because its fd
   became ready, then it is the primary listener, and everything is
   fine. However, if the greenthread was a secondary listener and awoke
   because a Timeout fired then it would remove the primary and promote a
   random secondary to primary.
   
   This commit makes hub.remove(listener) check to make sure listener is
   the primary, and if it's not, remove the listener from the
   secondaries.

   

   smerritt authored and tipabu committed Sep 22, 2020
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