torture: Added a function to setup a libssh based server
The added function runs the test server under timeout program to kill it
if it elapses the default timeout of 5 minutes.
An auxiliary function to create a libssh server configuration file was
Signed-off-by: Anderson Toshiyuki Sasaki <email@example.com>
Reviewed-by: Andreas Schneider <firstname.lastname@example.org>