Change logging-levels in method that push to the Eiffel Repository

We have realised that these cases are not as severe to have them as
warnings. So we demote them to Fine instead.
This will also prevent these log-messages from spamming the error_log
file when doing a backfill of tags

Solves: Jira GER-1789
Change-Id: I750843d6272b4c029e223b9b30d6979592525d7f

src/main/java/com/googlesource/gerrit/plugins/eventseiffel/EiffelEventHubImpl.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/eventseiffel/EiffelEventHubImpl.java b/src/main/java/com/googlesource/gerrit/plugins/eventseiffel/EiffelEventHubImpl.java
index 259b080..841aa4f 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/eventseiffel/EiffelEventHubImpl.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/eventseiffel/EiffelEventHubImpl.java
@@ -92,7 +92,7 @@
       idLookupLock.lock();
       try {
         if (!force && getExistingId(key, true).isPresent()) {
-          logger.atWarning().log("Event %s is already pushed.", key);
+          logger.atFine().log("Event %s is already pushed.", key);
           return;
         }
         synchronized (eventQueueLock) {
@@ -131,7 +131,7 @@
       if (fromHub != null) {
         if (key.matches(fromHub)) {
           if (expectingAbsent) {
-            logger.atWarning().log(
+            logger.atFine().log(
                 "Unexpected event found in queue: %s, with id: %s", key, fromHub.meta.id);
           }
           return Optional.of(fromHub.meta.id);
@@ -141,7 +141,7 @@
       }
       Optional<UUID> fromCache = idCache.getEventId(key);
       if (fromCache.isPresent() && expectingAbsent) {
-        logger.atWarning().log("Got unexpected event-id from cache: %s", fromCache.get());
+        logger.atFine().log("Got unexpected event-id from cache: %s", fromCache.get());
       }
       return fromCache;
     } finally {