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: I5c7e56384172751411ecf0394884feda1cfc3a3f

.zuul.yaml

@@ -112,7 +112,6 @@
 - project:
     templates:
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python3-zed-jobs
       - release-notes-jobs-python3
       - publish-openstack-docs-pti

lower-constraints.txt

@@ -1,123 +0,0 @@
-alabaster==0.7.10
-alembic==0.9.9
-amqp==2.2.2
-appdirs==1.4.3
-Babel==2.3.4
-cachetools==2.0.1
-certifi==2018.1.18
-chardet==3.0.4
-click==6.7
-cliff==2.11.0
-cmd2==0.8.2
-contextlib2==0.5.5
-coverage==4.0
-ddt==1.0.1
-debtcollector==1.19.0
-decorator==4.2.1
-deprecation==2.0
-docker==2.4.2
-docker-pycreds==0.2.2
-docutils==0.14
-dogpile.cache==0.6.5
-dulwich==0.19.0
-enum-compat==0.0.2
-eventlet==0.20.0
-extras==1.0.0
-fasteners==0.14.1
-fixtures==3.0.0
-Flask==0.10
-future==0.16.0
-futurist==1.6.0
-greenlet==0.4.13
-idna==2.6
-imagesize==1.0.0
-iso8601==0.1.12
-itsdangerous==0.24
-Jinja2==2.10
-jmespath==0.9.3
-jsonpatch==1.21
-jsonpointer==2.0
-jsonschema==3.2.0
-keystoneauth1==3.4.0
-kombu==4.1.0
-kuryr-lib==0.7.0
-linecache2==1.0.0
-Mako==1.0.7
-MarkupSafe==1.1.0
-monotonic==1.4
-mox3==0.25.0
-msgpack==0.5.6
-munch==2.2.0
-netaddr==0.7.19
-netifaces==0.10.6
-neutron-lib==1.13.0
-openstackdocstheme==2.2.1
-openstacksdk==0.12.0
-os-client-config==1.28.0
-os-service-types==1.2.0
-stestr==1.0.0
-osc-lib==1.10.0
-oslo.concurrency==3.25.0
-oslo.config==5.2.0
-oslo.context==2.20.0
-oslo.db==4.35.0
-oslo.i18n==3.20.0
-oslo.log==3.36.0
-oslo.messaging==5.36.0
-oslo.middleware==3.35.0
-oslo.policy==1.34.0
-oslo.serialization==2.18.0
-oslo.service==1.30.0
-oslo.utils==3.33.0
-oslotest==3.2.0
-packaging==17.1
-Paste==2.0.3
-PasteDeploy==1.5.2
-pbr==2.0.0
-pep8==1.5.7
-pika==0.10.0
-pika-pool==0.1.3
-prettytable==0.7.2
-Pygments==2.2.0
-pyinotify==0.9.6
-pyparsing==2.2.0
-pyperclip==1.6.0
-pyroute2==0.5.2
-python-dateutil==2.7.0
-python-editor==1.0.3
-python-keystoneclient==3.15.0
-python-mimeparse==1.6.0
-python-neutronclient==6.7.0
-python-subunit==1.0.0
-pytz==2018.3
-PyYAML==3.12
-reno==3.1.0
-repoze.lru==0.7
-requests==2.18.4
-requestsexceptions==1.4.0
-rfc3986==1.1.0
-Routes==2.4.1
-simplejson==3.13.2
-snowballstemmer==1.2.1
-Sphinx==2.0.0
-sphinxcontrib-websupport==1.0.1
-SQLAlchemy==1.2.5
-sqlalchemy-migrate==0.11.0
-sqlparse==0.2.4
-statsd==3.2.2
-stevedore==1.28.0
-Tempita==0.5.2
-tenacity==4.9.0
-testrepository==0.0.20
-testresources==2.0.1
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-urllib3==1.22
-vine==1.1.4
-voluptuous==0.11.1
-WebOb==1.7.4
-websocket-client==0.47.0
-Werkzeug==0.14.1
-wrapt==1.10.11

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

@@ -76,9 +76,3 @@ commands = {toxinidir}/tools/generate_config_file_samples.sh
 [testenv:releasenotes]
 deps = {[testenv:docs]deps}
 commands = sphinx-build -a -W -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
-
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt