https://github.com/pfsense/pfsense/commit/46a7c9aae#diff-9f6cbcc34208589ed90d936a29cbe8c9R120

This reverts commit d3492abd.
Per author request: CNAME does not fully work in unbound at
this point.

PR: https://forum.opnsense.org/index.php?topic=5140.0

PR: https://forum.opnsense.org/index.php?topic=5099.0

This reverts commit 2fa53c9e.

This needs fixing in the kernel instead :)

* Allow CNAME overrides for unbound

We allow for CNAME to be used in the host override for unbound.
This closes #1614.

* Make sure the cname field is filled in on edit.