Exclude flask import
Exclude flask import

since this might break with certain sphinx versions.

Closes #467

wheldom01/privacyidea,wheldom01/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,jh23453/privacyidea,jh23453/privacyidea,wheldom01/privacyidea,wheldom01/privacyidea,jh23453/privacyidea,wheldom01/privacyidea,privacyidea/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea,wheldom01/privacyidea