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: Idc88314ead611a6bea4dba9115b0aed9e551bb87

.zuul.yaml

@@ -2,7 +2,6 @@
     templates:
       - check-requirements
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python3-zed-jobs
       - release-notes-jobs-python3
     check:

lower-constraints.txt

@@ -1,69 +0,0 @@
-appdirs==1.4.0
-Babel==2.3.4
-bandit==1.4.0
-configparser==3.5.0
-coverage==4.0
-debtcollector==1.2.0
-docutils==0.11
-extras==1.0.0
-fixtures==3.0.0
-flake8==3.6.0
-funcsigs==1.0.0
-future==0.16.0
-gevent==1.2.2
-gitdb==0.6.4
-GitPython==1.0.1
-greenlet==0.4.10
-hacking==3.0.1
-iso8601==0.1.11
-Jinja2==2.10
-jira==2.0.0
-kazoo==2.2
-keystoneauth1==3.4.0
-linecache2==1.0.0
-mccabe==0.6.0
-monasca-common==2.16.0
-monasca-statsd==1.4.0
-monotonic==0.6
-mox3==0.20.0
-msgpack-python==0.4.0
-netaddr==0.7.20
-netifaces==0.10.4
-os-client-config==1.28.0
-os-testr==1.0.0
-oslo.config==5.2.0
-oslo.context==2.19.2
-oslo.i18n==3.15.3
-oslo.log==3.36.0
-oslo.policy==1.30.0
-oslo.serialization==2.18.0
-oslo.utils==3.33.0
-oslotest==3.2.0
-pbr==3.1.1
-pep8==1.5.7
-psycopg2==2.8.4
-pyflakes==2.0.0
-pyinotify==0.9.6
-PyMySQL==0.7.6
-pyparsing==2.1.0
-python-dateutil==2.5.3
-python-mimeparse==1.6.0
-python-statsd==2.1.0
-python-subunit==1.0.0
-pytz==2013.6
-PyYAML==3.13
-requests==2.14.2
-requestsexceptions==1.2.0
-rfc3986==0.3.1
-simplejson==3.8.1
-smmap==0.9.0
-sphinx==1.6.2
-SQLAlchemy==1.0.10
-stestr==1.0.0
-stevedore==1.20.0
-tabulate==0.8.1
-testrepository==0.0.18
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-wrapt==1.7.0

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

@@ -75,13 +75,6 @@ exclude=.venv,.git,.tox,dist,*egg,build
 import_exceptions =
   six.moves
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-  .[jira_plugin]
-
 [testenv:releasenotes]
 deps = -r{toxinidir}/doc/requirements.txt
 commands =