Silence warnings when version is not found on global refdb

Project version may or may not be present yet on the global refdb,
therefore it is not useful to SPAM the error log with lots of
infos and warnings.

The Gerrit admin can always turn on the logging and get the full
troubleshooting messages if needed.

Change-Id: If1cd2933dcbb1cb9b532a70a270f997bf0f7306d
diff --git a/src/main/java/com/googlesource/gerrit/plugins/multisite/consumer/SubscriberMetrics.java b/src/main/java/com/googlesource/gerrit/plugins/multisite/consumer/SubscriberMetrics.java
index 34f7717..474520e 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/multisite/consumer/SubscriberMetrics.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/multisite/consumer/SubscriberMetrics.java
@@ -97,7 +97,7 @@
         replicationStatusPerProject.put(projectName, lag);
         upsertMetricsForProject(projectName);
       } else {
-        logger.atWarning().log(
+        logger.atFine().log(
             "Didn't update metric for %s. Local [%b] or remote [%b] version is not defined",
             projectName, localVersion.isPresent(), remoteVersion.isPresent());
       }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/ProjectVersionRefUpdate.java b/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/ProjectVersionRefUpdate.java
index 848f2fa..361ba13 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/ProjectVersionRefUpdate.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/ProjectVersionRefUpdate.java
@@ -212,7 +212,7 @@
       Optional<IntBlob> blob = IntBlob.parse(repository, MULTI_SITE_VERSIONING_REF);
       if (blob.isPresent()) {
         Long repoVersion = Integer.toUnsignedLong(blob.get().value());
-        logger.atInfo().log("Local project '%s' has version %d", projectName, repoVersion);
+        logger.atFine().log("Local project '%s' has version %d", projectName, repoVersion);
         return Optional.of(repoVersion);
       }
     } catch (IOException e) {
@@ -228,7 +228,7 @@
     if (remoteObjectId.isPresent()) {
       return getLongFromObjectId(projectName, remoteObjectId.get());
     } else {
-      logger.atSevere().log("Didn't find remote version for %s", projectName);
+      logger.atFine().log("Didn't find remote version for %s", projectName);
       return Optional.empty();
     }
   }