Revert "[stats_lettuce_fix] fix for the lettuce error: Not found statistics counter notifyoutv4"

This reverts commit 14727f89.

tests/lettuce/features/xfrin_notify_handling.feature

@@ -44,9 +44,6 @@ Feature: Xfrin incoming notify handling
 
     A query for www.example.org to [::1]:47806 should have rcode NOERROR
 
-    # waiting for a second since the last query to Stats
-    sleep for 1 seconds
-
     #
     # Test for statistics
     #
@@ -121,9 +118,6 @@ Feature: Xfrin incoming notify handling
 
     A query for www.example.org to [::1]:47806 should have rcode NXDOMAIN
 
-    # waiting for a second since the last query to Stats
-    sleep for 1 seconds
-
     #
     # Test2 for statistics
     #