Upgrade to 6.6 breaks cert files

[tsd at tsdye.com]

> On Sun, Dec 13, 2015 at 07:05:53PM +0000, Tom Dye wrote:
>
>> I now get this when running offlineimap:
>>
>> ERROR: No CA certificates and no server fingerprints configured.  You
>> must
>> configure at least something, otherwise having SSL helps nothing.
>>
>> Any help appreciated.
>
> Well, for SSL to be effective, you have to configure a way to validate
> the certificate given by the server. Check what your provider provides
> you in this area and configure OfflineIMAP accordingly.
>
> --
> Nicolas Sebrecht
>

And this wasn't necessary previously?  OfflineIMAP worked before the
upgrade and .offlineimaprc hasn't changed.

All the best,
Tom