Drop lower-constraints.txt and its testing

As discussed in TC PTG[1] and TC resolution[2], we are
dropping the lower-constraints.txt file and its testing.
We will keep lower bounds in the requirements.txt file but
with a note that these are not tested lower bounds and we
try our best to keep them updated.

[1] https://etherpad.opendev.org/p/tc-zed-ptg#L326
[2] https://governance.openstack.org/tc/resolutions/20220414-drop-lower-constraints.html#proposal

Change-Id: Ie267542391366180089979e539c977c8e9f7550f

.zuul.yaml

@@ -1,7 +1,6 @@
 - project:
     templates:
       - check-requirements
-      - openstack-lower-constraints-jobs
       - openstack-python3-yoga-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

lower-constraints.txt

@@ -1,82 +0,0 @@
-alabaster==0.7.10
-alembic==0.9.8
-Babel==2.5.3
-certifi==2018.1.18
-chardet==3.0.4
-coverage==4.5.1
-debtcollector==1.19.0
-decorator==4.2.1
-docutils==0.14
-dogpile.cache==0.6.5
-dulwich==0.19.0
-elasticsearch==2.0.0
-extras==1.0.0
-falcon==1.0.0
-fixtures==3.0.0
-idna==2.6
-imagesize==1.0.0
-iso8601==0.1.12
-Jinja2==2.10
-jsonschema==3.2.0
-keystoneauth1==3.4.0
-keystonemiddleware==4.17.0
-linecache2==1.0.0
-logilab-common==1.4.1
-Mako==1.0.7
-MarkupSafe==1.1.1
-monotonic==1.4
-msgpack==0.5.6
-netaddr==0.7.19
-netifaces==0.10.6
-openstackdocstheme==1.31.2
-os-api-ref==1.4.0
-oslo.cache==1.29.0
-oslo.config==6.8.0
-oslo.context==2.22.0
-oslo.db==4.44.0
-oslo.i18n==3.15.3
-oslo.log==3.36.0
-oslo.middleware==3.31.0
-oslo.policy==3.6.0
-oslo.serialization==2.25.0
-oslo.upgradecheck==1.3.0
-oslo.utils==4.5.0
-oslotest==3.3.0
-Paste==2.0.2
-PasteDeploy==1.5.0
-pbr==3.1.1
-pycadf==2.7.0
-Pygments==2.2.0
-pyinotify==0.9.6
-pylint==2.4.0
-PyMySQL==0.7.6
-pyparsing==2.2.0
-python-dateutil==2.7.0
-python-editor==1.0.3
-python-keystoneclient==3.15.0
-python-mimeparse==1.6.0
-python-subunit==1.2.0
-pytz==2018.3
-PyYAML==5.1
-reno==2.5.0
-requests==2.23.0
-rfc3986==1.2.0
-snowballstemmer==1.2.1
-Sphinx==1.8.0
-sphinxcontrib-websupport==1.0.1
-sqlalchemy-migrate==0.11.0
-SQLAlchemy==1.2.5
-sqlparse==0.2.4
-statsd==3.2.2
-stestr==2.0.0
-stevedore==1.28.0
-Tempita==0.5.2
-testrepository==0.0.18
-testscenarios==0.5.0
-testresources==2.0.1
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-urllib3==1.22
-WebOb==1.7.4
-wrapt==1.11.0

requirements.txt

@@ -1,3 +1,7 @@
+# Requirements lower bounds listed here are our best effort to keep them up to
+# date but we do not test them so no guarantee of having them all correct. If
+# you find any incorrect lower bounds, let us know or propose a fix.
+
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.

tox.ini

@@ -82,9 +82,3 @@ commands = sphinx-build -W -a -E -d releasenotes/build/doctrees --keep-going -b
 
 [testenv:genpolicy]
 commands = oslopolicy-sample-generator --config-file etc/freezer/freezer-policy-generator.conf
-
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt