Resolve "Better detection of BIND 9"

Tomek Mrugalski requested to merge 831-better-detection-of-bind-9 into master

This MR added three small functionalities:

  1. the logging level is now configurable by using STORK_LOG_LEVEL. If not specified, or specified with garbage, the default value of INFO is used. (see !548 (closed)).
  2. the BIND9 detection is now a bit more verbose on info. It's much more verbose if DEBUG log level is enabled.
  3. It is possible to explicitly say the BIND 9 config file location using STORK_BIND9_CONFIG variable.

Closes #831 (closed)

Edited by Tomek Mrugalski

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