Avoid logging when sync is unnecessary due to cronjob log output spam

salt/common/tools/sbin/so-user

@@ -241,7 +241,7 @@ function syncAll() {
     staleCount=$(echo "select count(*) from identity_credentials where updated_at >= Datetime('now', '-${usersFileAgeSecs} seconds');" \
       | sqlite3 "$databasePath")
     if [[ "$staleCount" == "0" ]]; then
-      fail "Users are already in sync. Run 'FORCE_SYNC=1 $0 sync' to force a full sync anyway."
+      return 1
     fi
   fi
   syncElastic