Log the top-level exception name and message when crawling badness happens.

service/src/main/java/org/whispersystems/textsecuregcm/storage/AccountDatabaseCrawler.java

@@ -91,7 +91,7 @@ public class AccountDatabaseCrawler implements Managed, Runnable {
         accelerated = doPeriodicWork();
         sleepWhileRunning(accelerated ? ACCELERATED_CHUNK_INTERVAL : chunkIntervalMs);
       } catch (Throwable t) {
-        logger.warn("error in database crawl: ", t);
+        logger.warn("error in database crawl: {}: {}", t.getClass().getSimpleName(), t.getMessage(), t);
         Util.sleep(10000);
       }
     }