Hard-kill all connections and stop all listeners as soon as we decide we are in a minority. Also remve an export from rabbit_networking that was unused (probably dated from era of unsupervised plugins).
Separate out responsibilities in the various node state detection functions. Only ping_all/0 is allowed to establish new tcp connections (and thus take significant time for them to time out if necessary). This removes a significant delay while waiting for pause_minority to start.
Merge bug26225
stable to default