Finish and test the __init_askpass() method, works.
__init_askpass() had never been tested. Finish it and make sure it
works.
Signed-off-by: Jan Lindemann <jan@janware.com>
SSHClient(hostname) is an abstract class for SSH / SCP operations. It
comes with two implementations, SSHClientInternal an SSHClientCmd.
The former needs paramiko installed, which might be a reason to fail
on unprepared systems, the latter is slower and more limited.
Signed-off-by: Jan Lindemann <jan@janware.com>