Sorin Sbarnea 2410119ac9 ensure-tox: improve pip detection
Fixed issues failing to install tox on python3 only systems which have
only pip3 executable and not the pip one.

Needed-By: https://review.rdoproject.org/r/#/c/24584/
Change-Id: Ie50928c9b782ea84db916bb1441567e1206ff466
2020-01-16 21:06:07 +00:00
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