resolvconf update script failure leads to forgotten device

[Tobias Brunner]

Hi Corey,

FYI, I pushed a couple of commits ([1], [2]) that address this to master
so they will be included in our next release.

Regards,
Tobias

[1] https://git.strongswan.org/?p=strongswan.git;a=commitdiff;h=f4a20b74
[2] https://git.strongswan.org/?p=strongswan.git;a=commitdiff;h=f1064ca5