Set filepermission of enckey and signing key
Set filepermission of enckey and signing key

When creating the encryption key and the signing key
with pi-manage the file permission is set to 400.
The user still has to set the right ownership.

Closes #222

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