Properly free up enqueued netievents in nm_destroy()
When the isc_netmgr is being destroyed, the normal and priority queues should be dequeued and netievents properly freed. This wasn't the case.
Edited by Ondřej Surý
When the isc_netmgr is being destroyed, the normal and priority queues should be dequeued and netievents properly freed. This wasn't the case.