Drop lower-constraints.txt and its testing

As discussed in TC PTG[1] and TC resolution[2], 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

Co-Authored-By: Manpreet Kaur <kaurmanpreet2620@gmail.com>

Change-Id: I1c7e8363b045487e4620613fdd37139b3d256758

.zuul.yaml

@@ -2,6 +2,5 @@
     templates:
       - check-requirements
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python3-zed-jobs
       - publish-openstack-docs-pti

lower-constraints.txt

@@ -1,38 +0,0 @@
-alabaster==0.7.10
-appdirs==1.3.0
-cliff==2.8.0
-cmd2==0.8.0
-coverage==4.0
-docutils==0.11
-extras==1.0.0
-fixtures==3.0.0
-imagesize==0.7.1
-iso8601==0.1.11
-Jinja2==2.10
-keystoneauth1==3.4.0
-linecache2==1.0.0
-MarkupSafe==1.0
-mox3==0.20.0
-os-client-config==1.28.0
-oslosphinx==4.7.0
-oslotest==3.2.0
-pbr==2.0.0
-prettytable==0.7.2
-Pygments==2.2.0
-pyparsing==2.1.0
-pyperclip==1.5.27
-python-dateutil==2.5.3
-python-mimeparse==1.6.0
-python-subunit==1.0.0
-pytz==2013.6
-PyYAML==3.12
-requests==2.14.2
-requestsexceptions==1.2.0
-snowballstemmer==1.2.1
-stestr==2.0.0
-stevedore==1.20.0
-testrepository==0.0.18
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0

requirements.txt

@@ -1,3 +1,6 @@
+# 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

@@ -47,8 +47,3 @@ builtins = _
 ignore = W503,W504
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt