API: Fix labels return code
Created by: Razer6
What does this MR do?
This PR fixes the return codes of labels API in case of errors. It's better to return 400 for invalid parameters than 409. Thanks @jubianchi
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: Razer6
This PR fixes the return codes of labels API in case of errors. It's better to return 400 for invalid parameters than 409. Thanks @jubianchi