Title: #280: Set explicit confdir option for global contexts
@pvoborni No, my answer is an disagreement. Honza does not want the approve the
PR as it stands now.
My proposal is
* Review this PR under the premise that it does not break current code when
```IPA_CONFDIR``` is absent.
* Review the disputable code lines after my deadline and within the next two
weeks. Some of them might need an explicit confdir, some might not. I need to
carefully think about each call.
See the full comment at
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