* `Processors.process_zone_config` method added to allow processors that work
  with the zone config data. Configured with `manager.zone-processors: []`,
  default is ['dynamic-zone-config']
* Converted dynamic zone config to be a processors ^, if zone-processors are
  explicitely configured and dynamic zone config is desired
  `dyanmic-zone-config` must be included in the list as the desired position
* Loads of additional testin/vetting for the above functionality

Basically changing from
https://www.rfc-editor.org/rfc/rfc4034.html#section-2.1 to https://www.rfc-editor.org/rfc/rfc4034.html#section-5.1

So:
flags -> key_tag
protocol -> algorithm
algorithm -> digest_type
public_key -> digest

Resolved a typo that prevented the auto-arpa configuration options from
loading.

This reverts commit 6f39fcc5f7.

Fixing #1038