ab9a68c784
As part of community goal of dropping py27 support[1], we are moving the devstack to py3 by default[2]. That will make grenade job to perform upgrade from py2 to py3 which will not work (we have seen the failure in neutron-grenade job). To avoid existing grenade py2 job break, this commit moves grenade jobs to py3 which is what we planned as part dropping the py2 support. [1] https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html [2] https://review.opendev.org/#/c/649097/12 http://lists.openstack.org/pipermail/openstack-discuss/2019-November/010938.html Depends-On: https://review.opendev.org/#/c/649097/ Change-Id: I36229a3fc0bbcd994907154b638d24737959e6e3