Jens Harbott 88139ef622 Install pbr in pip3 role to fix issue xenial
When installing bots on eavesdrop with py27/py35, there is a
regression with the latest pbr release. The workaround is to
have pbr preinstalled in the pip3 role.

Change-Id: I5ea790a50e180df36b480dcbb13530a80f398b5e
2021-05-27 12:35:25 +02:00
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