python/ecdsa: Update to version 0.11.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
python/paramiko: Update to version 1.15.1.

The SFTP-tests fail in conjunction with UTF8 directories, so let's skip
them for now. We also need to disable big file tests, because they rely
on SFTP as well and simply fail if the normal SFTP tests were skipped.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>