Michal Nasiadka 063a46a7de Upgrade virtualenv in pre
Since virtualenv 20.0 (amongst other changes) six version >1.12.0 is required.
This change adds upgrade of virtualenv and six in pre - to be reverted once
infra CentOS images are sorted out.

Depends-On: https://review.opendev.org/707377
Change-Id: I75249055989309d0afdfc29c894beb6b1fcd1994
2020-02-12 13:48:46 +01:00
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2020-02-12 13:48:46 +01:00
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