init optional and logging fixes (#3965)

Signed-off-by: Justin Florentine <justin+github@florentine.us>

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/manager/EthProtocolManager.java

@@ -78,7 +78,7 @@ public class EthProtocolManager
   private final Blockchain blockchain;
   private final BlockBroadcaster blockBroadcaster;
   private final List<PeerValidator> peerValidators;
-  private Optional<Difficulty> powTerminalDifficulty;
+  private Optional<Difficulty> powTerminalDifficulty = Optional.empty();
   private final StampedLock powTerminalDifficultyLock = new StampedLock();
   private Hash lastFinalized = Hash.ZERO;
   private final AtomicLong numFinalizedSeen = new AtomicLong(0);

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/PivotSelectorFromFinalizedBlock.java

@@ -48,7 +48,7 @@ public class PivotSelectorFromFinalizedBlock implements PivotBlockSelector {
     if (maybeHash.isPresent()) {
       return Optional.of(selectLastFinalizedBlockAsPivot(maybeHash.get()));
     }
-    LOG.info("No finalized block hash announced yet");
+    LOG.trace("No finalized block hash announced yet");
     return Optional.empty();
   }
 

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/TransitionPivotSelector.java

@@ -68,7 +68,7 @@ public class TransitionPivotSelector implements PivotBlockSelector {
     }
 
     if (bestPeerEstDifficulty.greaterOrEqualThan(totalTerminalDifficulty)) {
-      LOG.info(
+      LOG.debug(
           "Chain has reached TTD, best peer has estimated difficulty {},"
               + " select pivot from finalized block",
           bestPeerEstDifficulty);