The watcher::api::watcher_client_password parameter was deprecated
during Yoga cycle in favor of the new watcher::watcher_clients_auth
class[1]. Thus the parameter should not be validated.
[1] 16bcc44238bd018c527c87c4cd0542f5cadc5774
Closes-Bug: #1973316
Change-Id: Ied515e3ba52d9fb9bd96ea24149fa7f6c44db9c5