core: refine DKG aborting (#512)

* Avoid aborting the DKG protocol registered later

Although that DKG protocol would be registered after
1/2 round, both of them are triggered in separated
go routine and we shouldn't assuem their execution order.

* Capitalize logs

* Add test

* Return aborted when not running

* Log DKG aborting result

* Remove duplicated DKG abort

1 files changed, 2 insertions, 2 deletions

diff --git a/core/agreement.go b/core/agreement.go
index b0c7734..1919830 100644
--- a/core/agreement.go
+++ b/core/agreement.go
@@ -239,14 +239,14 @@ func (a *agreement) restart(
 
 	for _, block := range replayBlock {
 		if err := a.processBlock(block); err != nil {
-			a.logger.Error("failed to process block when restarting agreement",
+			a.logger.Error("Failed to process block when restarting agreement",
 				"block", block)
 		}
 	}
 
 	for _, vote := range replayVote {
 		if err := a.processVote(vote); err != nil {
-			a.logger.Error("failed to process vote when restarting agreement",
+			a.logger.Error("Failed to process vote when restarting agreement",
 				"vote", vote)
 		}
 	}