* babe: replace usage of SharedEpochChanges with internal RPC * babe-rpc: fix tests * babe: use SinkExt::send instead of Sender::try_send SinkExt::send provides backpressure in case the channel is full * Update client/consensus/babe/src/lib.rs Co-authored-by: Bastian Köcher <git@kchr.de> * babe: fix spawn * babe: send handles backpressure * babe: use testing::TaskExecutor * babe-rpc: better error handling --------- Co-authored-by: Bastian Köcher <git@kchr.de>