[strongSwan] VICI event callbacks

[Tobias Brunner]

Hi Anthony,

> 1. Gateway rejected the connection attempt due to authentication failure

You need to use the error-notify plugin [1] for this.

> 2. COMM+ rejected the connection attempt due the following errors:

Same as above.

> 3. No response from gateway

Same as above.

Regards,
Tobias

[1] https://wiki.strongswan.org/projects/strongswan/wiki/ErrorNotifyPlugin