Title: #271: Remove hard dependency on ipaplatform from ipapython, ipalib and
I do not have much trouble reviewing the whole PR, also it does not do that
much and does not break tests (did not try integration) so I believe it's fine.
I am not sure if adding all the os.path.joins is actually really necessary here
but it'd be more foolproof for the future.
See the full comment at
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