python-paramiko: Update to new version 1.12.0.

A small summary of the changes:

 - Add tentative support for ECDSA keys.
 - Add server-side support for the SSH protocol's 'env' command.

The full change log can be found at:

https://github.com/aszlig/paramiko/blob/master/NEWS



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