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: Iffb4cb72243a7624332f4718f6d658b3fd4926a5

lower-constraints.txt

@@ -1,115 +0,0 @@
-amqp==2.1.1
-appdirs==1.4.3
-asn1crypto==0.24.0
-Babel==2.5.3
-bandit==1.4.0
-cachetools==2.0.0
-certifi==2018.1.18
-cffi==1.14.0
-chardet==3.0.4
-cliff==2.11.0
-cmd2==0.8.2
-contextlib2==0.4.0
-coverage==4.0
-cryptography==2.2.1
-ddt==1.0.1
-debtcollector==1.19.0
-decorator==4.2.1
-deprecation==2.0
-doc8==0.6.0
-docker==2.4.2
-docker-pycreds==0.2.2
-docutils==0.11
-dogpile.cache==0.6.5
-eventlet==0.18.2
-extras==1.0.0
-fasteners==0.7.0
-fixtures==3.0.0
-future==0.16.0
-futurist==1.2.0
-gitdb==0.6.4
-GitPython==1.0.1
-greenlet==0.4.15
-idna==2.6
-iso8601==0.1.12
-Jinja2==2.10
-jmespath==0.9.3
-jsonpatch==1.21
-jsonpointer==2.0
-jsonschema==2.6.0
-keystoneauth1==3.4.0
-kombu==4.0.0
-linecache2==1.0.0
-MarkupSafe==1.1.1
-monotonic==1.4
-mox3==0.20.0
-msgpack==0.5.6
-msgpack-python==0.4.0
-munch==2.2.0
-netaddr==0.7.19
-netifaces==0.10.6
-openstacksdk==0.12.0
-os-client-config==1.29.0
-os-service-types==1.2.0
-osc-lib==1.8.0
-oslo.concurrency==3.26.0
-oslo.config==5.2.0
-oslo.context==2.20.0
-oslo.i18n==3.15.3
-oslo.log==3.36.0
-oslo.messaging==5.29.0
-oslo.middleware==3.31.0
-oslo.serialization==2.25.0
-oslo.service==1.24.0
-oslo.utils==3.33.0
-oslotest==3.2.0
-osprofiler==1.4.0
-packaging==17.1
-paramiko==2.0.0
-Paste==2.0.2
-PasteDeploy==1.5.0
-pbr==2.0.0
-pika==0.10.0
-pika-pool==0.1.3
-positional==1.2.1
-prettytable==0.7.1
-pyasn1==0.1.8
-pycparser==2.18
-pyinotify==0.9.6
-pyOpenSSL==17.5.0
-pyparsing==2.2.0
-pyperclip==1.6.0
-python-cinderclient==3.5.0
-python-dateutil==2.7.0
-python-glanceclient==2.9.1
-python-keystoneclient==3.15.0
-python-mimeparse==1.6.0
-python-novaclient==10.1.0
-python-openstackclient==3.12.0
-python-subunit==1.0.0
-pytz==2018.3
-PyYAML==3.13
-repoze.lru==0.7
-requests==2.18.4
-requestsexceptions==1.4.0
-restructuredtext-lint==1.1.1
-rfc3986==1.1.0
-Routes==2.3.1
-simplejson==3.13.2
-smmap==0.9.0
-statsd==3.2.1
-stestr==2.0.0
-stevedore==1.28.0
-tempest==17.1.0
-tenacity==3.2.1
-testresources==2.0.0
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-urllib3==1.22
-vine==1.1.4
-warlock==1.3.0
-WebOb==1.7.1
-websocket-client==0.44.0
-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

@@ -95,9 +95,3 @@ setenv =
 # environments to specify a CA bundle file to use in verifying a
 # TLS (https) server certificate.
 passenv = OS_*
-
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt