Stop logging configured Sure Petcare credentials

[robinsondan87]

Summary

• stop writing the configured Sure Petcare username and password to add-on logs
• warn when either required credential is missing
• keep the existing startup command and credential handling unchanged

Why

The add-on currently logs the configured cloud username and password during startup. These values can remain visible in Home Assistant Supervisor logs. The add-on only needs to know whether the values are present, not print the values themselves.

Validation

• bash -n pethublocal/rootfs/etc/services.d/pethublocal/run
• checked the run script no longer logs username/password values

[plambrechtsen]

Hi. The whole approach of using this addon no longer applies as new firmware has been pushed to all the hubs preventing the previous DNS poison approach.

I do however have a completely new approach. If you send me an email I can let you know how it works.