Title: #182: Use env var IPA_CONFDIR to get confdir for 'cli' context
The argument is mood. Even now you can't tell which config file ```ipa ping```
is going to load. There are tons of ways to modify behavior, e.g. mount binds,
LD_PRELOAD, a ```sitecustomize.py``` or a ```.pth``` file in the users
site-packages which mokey-patches ```ipaplatform.paths.paths```...
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