Adding wal_recovery_mode log message

Summary:
wal_recovery_mode setting was not written to LOG. This diff
adds the log message

Test Plan: manually checked

Reviewers: kradhakrishnan, sdong, igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D43953

util/options.cc

@@ -369,6 +369,8 @@ void DBOptions::Dump(Logger* log) const {
         bytes_per_sync);
     Warn(log, "                      Options.wal_bytes_per_sync: %" PRIu64,
         wal_bytes_per_sync);
+    Warn(log, "                       Options.wal_recovery_mode: %d",
+        wal_recovery_mode);
     Warn(log, "                  Options.enable_thread_tracking: %d",
         enable_thread_tracking);
     if (row_cache) {