[strongSwan] more info in log message "deleting half open IKE_SA after timeout"

[Tobias Brunner]

Hi Walter,

> With the patch, I hope to be able to see if it's one of "our" clients failing to connect because 
> of e.g. fragments being dropped, or it's some scan attempt "from far away". 

Enabling the `ike_name` option for the configured logger(s) might also
help as you could then correlate the "... is initiating an IKE_SA"
message with this one via the IKE_SA's unique identifier.

> If the patch is considered useful, feel free to add it. 

It doesn't hurt and the IP is also logged when an established IKE_SA is
deleted, so I've added it to master.

Thanks,
Tobias