It is no longer supported by jammy and lead us to the following errors with the announce-release job.
```
No package matching 'python-dev' is available
```
Change-Id: Ia9e33bd46dbd98c2b83486f3bf95affabcd13b27
Create a tox environment for running the unit tests against the lower
bounds of the dependencies.
Create a lower-constraints.txt to be used to enforce the lower bounds
in those tests.
Add openstack-tox-lower-constraints job to the zuul configuration.
Add missing dev packages for libxml and libxslt to the bindep config
file.
See http://lists.openstack.org/pipermail/openstack-dev/2018-March/128352.html
for more details.
Change-Id: I4a51633916661bdfa926eb231b8e482628887e90
Depends-On: https://review.openstack.org/555034
Signed-off-by: Doug Hellmann <doug@doughellmann.com>
Hervé Beraud