* adnshost, adnslogres, adnsresfilter have options for config override.
* adnsresfilter has --debug option.
* Improvements to adnslogres (incl. new -c option) from Tony Finch.
- * Regression tests now include `adnshost' invocations.
+ * Regression tests now include adnshost, adnslogres, adnsresfilter.
* Test cancellation both before and after query completion.
Portability fixes: