Fix minor bug in Deferred usage in deploy_server.

Signed-off-by: Daira Hopwood <david-sarah@jacaranda.org>
Output "Signup done." to signup log file.

Signed-off-by: Daira Hopwood <david-sarah@jacaranda.org>
Fix a typo.

Signed-off-by: Daira Hopwood <david-sarah@jacaranda.org>