Don't require domain_id in find_record* methods

* Requiring domain_id makes the method useless when you actually don't have the
  domain id in for example finding records based on upcoming managed_tenant_id
  columns.
* Can be done by passing the domain_id in the criterion instead which is
  effectively what it does anyways. Which is what is done here in a higher
  level.

Change-Id: I2c93cea8aa25763fe85393e5e51b8a06151eba40