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: I7e70c45ecd294dfd7610f446ff1f382c590f9d64

lower-constraints.txt

-alabaster==0.7.10
-amqp==2.1.1
-appdirs==1.3.0
-asn1crypto==0.23.0
-Babel==2.3.4
-bandit==1.4.0
-cachetools==2.0.0
-cffi==1.14
-cliff==2.8.0
-cmd2==0.8.0
-contextlib2==0.4.0
-coverage==4.0
-cryptography==3.0
-debtcollector==1.2.0
-decorator==3.4.0
-deprecation==1.0
-docutils==0.11
-dogpile.cache==0.6.2
-dulwich==0.15.0
-eventlet==0.18.2
-extras==1.0.0
-fasteners==0.7.0
-fixtures==3.0.0
-flake8==2.5.5
-futurist==1.2.0
-gitdb==0.6.4
-GitPython==1.0.1
-greenlet==0.4.15
-hacking==0.12.0
-idna==2.6
-imagesize==0.7.1
-iso8601==0.1.11
-Jinja2==2.10
-jmespath==0.9.0
-jsonpatch==1.16
-jsonpointer==1.13
-jsonschema==2.6.0
-keystoneauth1==3.4.0
-kombu==4.0.0
-linecache2==1.0.0
-MarkupSafe==1.0
-mccabe==0.2.1
-monotonic==0.6
-mox3==0.20.0
-msgpack-python==0.4.0
-munch==2.1.0
-netaddr==0.7.18
-netifaces==0.10.4
-openstacksdk==0.11.2
-os-client-config==1.28.0
-os-service-types==1.2.0
-osc-lib==1.8.0
-oslo.concurrency==3.25.0
-oslo.config==5.2.0
-oslo.context==2.19.2
-oslo.i18n==3.15.3
-oslo.log==3.36.0
-oslo.messaging==5.29.0
-oslo.middleware==3.31.0
-oslo.serialization==2.18.0
-oslo.service==1.24.0
-oslo.utils==3.33.0
-oslotest==3.2.0
-osprofiler==1.4.0
-Paste==2.0.2
-PasteDeploy==1.5.0
-pbr==2.0.0
-pep8==1.5.7
-pika==0.10.0
-pika-pool==0.1.3
-positional==1.2.1
-prettytable==0.7.2
-pycparser==2.18
-pyflakes==0.8.1
-Pygments==2.2.0
-pyinotify==0.9.6
-pyOpenSSL==19.1.0
-pyparsing==2.1.0
-pyperclip==1.5.27
-python-cinderclient==3.3.0
-python-dateutil==2.5.3
-python-glanceclient==2.8.0
-python-keystoneclient==3.8.0
-python-mimeparse==1.6.0
-python-novaclient==9.1.0
-python-openstackclient==3.12.0
-python-subunit==1.0.0
-pytz==2013.6
-PyYAML==3.12
-repoze.lru==0.7
-requests==2.14.2
-requestsexceptions==1.2.0
-rfc3986==0.3.1
-Routes==2.3.1
-simplejson==3.5.1
-smmap==0.9.0
-snowballstemmer==1.2.1
-statsd==3.2.1
-stevedore==1.20.0
-tenacity==3.2.1
-stestr==2.0.0
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-vine==1.1.4
-warlock==1.2.0
-WebOb==1.7.1
-wrapt==1.7.0

requirements.txt

+# 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

@@ -76,13 +76,6 @@ exclude=.venv,.git,.tox,dist,doc,,*lib/python*,*egg,build
 [hacking]
 import_exceptions = magnumclient._i18n
 
-[testenv:lower-constraints]
-basepython = python3
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-
 [testenv:releasenotes]
 basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt