s/ping/finger

Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
specs: Replace shell by exec (more generic)

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Fix certificate file extensions

Closes: #75

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Use 8443 as the server port

Issue: #73

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Prompt for certificate before asking for password

Closes: #72

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>