* Replace foreach+set combo with a script processor

The `set` processor expands the dots contained in the field name into
subfield.

Sometimes attributes contained in `authentication_processing_details`
have dots, for example:

    # source
    {"key": "a.b.c", "value": true}

In such cases, the `set` processor would turn it into:

    # this is a side-effect
    {
      "a": {
        "b": {
          "c": true
        }
      }
    }

Instead of:

    # this is the expected result
    {"a.b.c": True}

* Update changelog

(cherry picked from commit a0b2db2)