Drop lower-constraints

Lower-constraints is not a requirement of the OpenStack Python PTI
[0] and there currently is a discussion on the mailing list [1]
about dropping the test, with the oslo team already having done
so [2].

The new dependency resolver in pip fails due to incompatible
dependency versions in our lower-constraints file, meaning that
we were never providing any real guarantees with it.

To unblock the CI, I am disabling lower-constraints job for now,
with the option to reenable it in case we fix the constraints,
and based on the outcome of the mailing list discussions and
consensus.

[0]. https://governance.openstack.org/tc/reference/pti/python.html
[1].
http://lists.openstack.org/pipermail/openstack-discuss/2021-January/019672.html
[2].
http://lists.openstack.org/pipermail/openstack-discuss/2021-January/019659.html

Change-Id: I04e49f005841eb341c2d53cbc469252c089d1ab5

lower-constraints.txt

@@ -1,57 +0,0 @@
-alabaster==0.7.10
-appdirs==1.4.3
-Babel==2.5.3
-bandit==1.4.0
-certifi==2018.1.18
-chardet==3.0.4
-coverage==4.5.1
-debtcollector==1.19.0
-docutils==0.14
-dulwich==0.19.0
-extras==1.0.0
-fixtures==3.0.0
-gitdb2==2.0.3
-GitPython==2.1.8
-idna==2.6
-imagesize==1.0.0
-iso8601==0.1.12
-Jinja2==2.10
-keystoneauth1==3.4.0
-linecache2==1.0.0
-MarkupSafe==1.0
-mox3==0.25.0
-msgpack==0.5.6
-netaddr==0.7.19
-netifaces==0.10.6
-openstack-requirements==1.2.0
-os-client-config==1.29.0
-oslo.config==5.2.0
-oslo.context==2.20.0
-oslo.i18n==3.20.0
-oslo.serialization==2.25.0
-oslo.utils==3.36.0
-oslotest==3.3.0
-packaging==17.1
-Parsley==1.3
-pbr==3.1.1
-Pygments==2.2.0
-pyinotify==0.9.6
-pyparsing==2.2.0
-python-dateutil==2.7.0
-python-mimeparse==1.6.0
-python-subunit==1.2.0
-pytz==2018.3
-PyYAML==3.12
-requests==2.18.4
-requestsexceptions==1.4.0
-rfc3986==1.1.0
-smmap2==2.0.3
-snowballstemmer==1.2.1
-stestr==2.0.0
-stevedore==1.28.0
-systemd-python==234
-testrepository==0.0.20
-testtools==2.3.0
-traceback2==1.4.0
-urllib3==1.22
-wrapt==1.10.11

tox.ini

@@ -54,12 +54,6 @@ commands =
 [testenv:bandit]
 commands = bandit -r oslo_log -x tests -n5
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
 # W503, W504 skipped: https://www.python.org/dev/peps/pep-0008/#should-a-line-break-before-or-after-a-binary-operator