Fix comparison against wrong constant

The comparison was against the wrong constant value.
As described in the comment the check is there to guarantee
to not propagate events realted to stale deleted elements

Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>

libnetwork/networkdb/delegate.go

@@ -228,7 +228,8 @@ func (nDB *NetworkDB) handleTableEvent(tEvent *TableEvent) bool {
 		// If it is a delete event and we did not have a state for it, don't propagate to the application
 		// If the residual reapTime is lower or equal to 1/6 of the total reapTime don't bother broadcasting it around
 		// most likely the cluster is already aware of it, if not who will sync with this node will catch the state too.
-		return e.reapTime > reapPeriod/6
+		// This also avoids that deletion of entries close to their garbage collection ends up circuling around forever
+		return e.reapTime > reapEntryInterval/6
 	}
 
 	var op opType