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

Change-Id: Ib425c4791477803224460b536fe88c506e36d623
(cherry picked from commit fa1a31a448)

.zuul.yaml

@@ -2,7 +2,6 @@
     templates:
       - check-requirements
       - horizon-non-primary-django-jobs
-      - openstack-lower-constraints-jobs-horizon
       - openstack-python3-jobs-horizon
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

lower-constraints.txt

@@ -1,58 +0,0 @@
-Babel==2.3.4
-certifi==2018.1.18
-chardet==3.0.4
-cliff==2.11.0
-cmd2==0.8.1
-colorama==0.3.9
-coverage==4.0
-debtcollector==1.19.0
-django-appconf==1.0.2
-django-babel==0.6.2
-django-compressor==2.0
-django-pyscss==2.0.2
-Django==2.2
-extras==1.0.0
-fixtures==3.0.0
-horizon==17.1.0
-idna==2.6
-iso8601==0.1.12
-keystoneauth1==3.4.0
-linecache2==1.0.0
-monotonic==1.4
-mox3==0.20.0
-msgpack==0.5.6
-netaddr==0.7.19
-netifaces==0.10.6
-nodeenv==0.9.4
-openstack-requirements==1.2.0
-oslo.config==5.2.0
-oslo.context==2.20.0
-oslo.i18n==3.20.0
-oslo.log==3.37.0
-oslo.serialization==2.25.0
-oslo.utils==3.36.0
-packaging==17.1
-Parsley==1.3
-pbr==2.0.0
-prettytable==0.7.2
-pyinotify==0.9.6
-pyparsing==2.2.0
-pyperclip==1.6.0
-pyScss==1.3.7
-pytest==5.3.5
-python-blazarclient==1.0.1
-python-dateutil==2.7.0
-python-mimeparse==1.6.0
-pytz==2018.3
-PyYAML==3.13
-rcssmin==1.0.6
-requests==2.18.4
-rfc3986==1.1.0
-rjsmin==1.0.12
-stevedore==1.28.0
-termcolor==1.1.0
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-urllib3==1.22
-wrapt==1.10.11

requirements.txt

@@ -1,3 +1,8 @@
+# Note: Requirements lower bounds listed here are our best effort to keep them
+# up to date but we do not test them so there is 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

@@ -67,12 +67,6 @@ ignore = F405,W504
 exclude = .venv,.git,.tox,dist,*lib/python*,*egg,build,node_modules
 max-complexity = 20
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-
 [testenv:bandit]
 deps = -r{toxinidir}/test-requirements.txt
 commands = bandit -r blazar_dashboard -l -n 5 -x blazar_dashboard/test