Trace whether whitelisting is enalbed or disabled in dalidiag -whitelist

dalidiag <dali-ip> -whitelist traces the populated whitelist whether disabled or enabled.

NB: If disabled clients are never blocked, but the whitelist is still present and warnings are issued to Dali log only.

It would be useful if dalidiag <dali-ip> -whitelist, also traced whether the feature was enabled or not.