Bug fix for GnuTLS 3: be compatible with old 2048-bit DSA keys.
The mandos-keygen program in Mandos version 1.6.0 and older generated 2048-bit DSA keys, and when GnuTLS uses these it has trouble connecting using the Mandos default priority string. This was previously fixed in Mandos 1.6.2, but the bug reappeared when using GnuTLS 3, so the default priority string has to change again; this time also the Mandos client has to change its default, so now the server and the client should use the same default priority string: