Ghanshyam Mann 3bdc8f66ad Add a variable to configure the Tempest venv upper constraints ...

We use Tempest master for testing the supported stable
branches so using master upper constraints works fine but
when we need to use old Tempest in the below cases then master
upper constraints do not work and devstack will not be
able to install Tempest in vnenv:

- Testing Extended Maintenance branch
- Testing py2.7 jobs until stable/train with in-tree tempest plugins

This commit adds a variable to set the compatible upper constraint
to use for Tempest's old version.

Few of the current failure which can be fixed by this new configurable var:
- networking-generic-switch-tempest-dlm-python2
  - https://zuul.opendev.org/t/openstack/build/ebcf3d68d62c4af3a43a222aa9ce5556
- devstack-platform-xenial on stable/steinand stable/train
  - https://zuul.opendev.org/t/openstack/build/37ffc1af6f3f4b44b5ca8cbfa27068ac

Change-Id: I5b2217d85e6871ca3f7a3f6f859fdce9a50d3946

2021-02-20 14:05:36 -06:00

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