Title: #182: Use env var IPA_CONFDIR to get confdir for 'cli' context
If I understand it correctly, the review is stalled for some time given that
there is misalignment if this pull request is needed. As described in
Christian's design page:
there is clear method how to do it with current code.
**So this cannot be regarded as a blocker for the whole effort.**
It is only a convenience method for people who rather uses env variable instead
of conf dir option.
From maintenance perspective it is just another use case to support.
See the full comment at
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