use new check_url_available promise from slapos.toolbox 0.123
This follows the changes to the check_url_available
promise in nexedi/slapos.toolbox
proposed in slapos.toolbox!98 (closed). Briefly:
- rename
http_code
tohttp-code
- change
check-secure = 1
tohttp-code = 401
- increment version of
slapos.toolbox
egg.
We also use the new password check feature in the monitoring stack.