Reduce Log Noise (#261)

Some more logging level downgrades.
* At steady state we should get only one info level log per new block
* We don't need to know about peer stuff at info
* Caught up to best peer fires for every block

ethereum/eth/src/main/java/tech/pegasys/pantheon/ethereum/eth/sync/Downloader.java

@@ -151,7 +151,7 @@ public class Downloader<C> {
       if (peerTd.compareTo(syncState.chainHeadTotalDifficulty()) <= 0
           && peerHeight <= syncState.chainHeadNumber()) {
         // We're caught up to our best peer, try again when a new peer connects
-        LOG.info("Caught up to best peer: " + bestPeer.chainState().getEstimatedHeight());
+        LOG.debug("Caught up to best peer: " + bestPeer.chainState().getEstimatedHeight());
         return waitForPeerAndThenSetSyncTarget();
       }
       return DetermineCommonAncestorTask.create(

ethereum/eth/src/main/java/tech/pegasys/pantheon/ethereum/eth/sync/tasks/GetBlockFromPeerTask.java

@@ -49,7 +49,7 @@ public class GetBlockFromPeerTask extends AbstractPeerTask<Block> {
 
   @Override
   protected void executeTaskWithPeer(final EthPeer peer) throws PeerNotConnected {
-    LOG.info("Downloading block {} from peer {}.", hash, peer);
+    LOG.debug("Downloading block {} from peer {}.", hash, peer);
     downloadHeader(peer)
         .thenCompose(this::completeBlock)
         .whenComplete(
@@ -61,7 +61,7 @@ public class GetBlockFromPeerTask extends AbstractPeerTask<Block> {
                 LOG.info("Failed to download block {} from peer {}.", hash, peer);
                 result.get().completeExceptionally(new IncompleteResultsException());
               } else {
-                LOG.info("Successfully downloaded block {} from peer {}.", hash, peer);
+                LOG.debug("Successfully downloaded block {} from peer {}.", hash, peer);
                 result.get().complete(new PeerTaskResult<>(r.getPeer(), r.getResult().get(0)));
               }
             });

ethereum/eth/src/main/java/tech/pegasys/pantheon/ethereum/eth/sync/tasks/WaitForPeerTask.java

@@ -37,7 +37,7 @@ public class WaitForPeerTask extends AbstractEthTask<Void> {
   @Override
   protected void executeTask() {
     final EthPeers ethPeers = ethContext.getEthPeers();
-    LOG.info(
+    LOG.debug(
         "Waiting for new peer connection. {} peers currently connected, {} idle.",
         ethPeers.peerCount(),
         ethPeers.idlePeer().isPresent() ? "Some peers" : "No peers");
@@ -45,7 +45,7 @@ public class WaitForPeerTask extends AbstractEthTask<Void> {
     peerListenerId =
         ethPeers.subscribeConnect(
             (peer) -> {
-              LOG.info("Finished waiting for peer connection.");
+              LOG.debug("Finished waiting for peer connection.");
               // We hit our target
               result.get().complete(null);
             });