macros, docs, releng: Use `sudo -H` pip install

This is still far from a clean and secure approach, as `pip install`
should not be ran with `sudo`.
However, `-H` limits the area we touch and also fixes some incompat
between disto-provided pip and pip-provided pip.

Change-Id: I0e19dfeaf66f6f453e3868c71016305ae050f0c8
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

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