Description of problem:
During the 3.3 to 3.4 db upgrade
if there is a VDS_HIGH_NETWORK_USE event in event_subscriber the db upgrade fails with fk violation
update event_map set event_up_name = 'HOST_INTERFACE_HIGH_NETWORK_USE' where event_up_name='VDS_HIGH_NETWORK_USE';
1) Have a running 3.3 installation
2) From UI Users/Event Notifications subscribe any user to event VDS_HIGH_NETWORK_USE
3) Upgrade your system to 3.4
4) Open UI/Event Notifications for the user in 2) , you should see that this user is subscribed now to HOST_INTERFACE_HIGH_NETWORK_USE