Drop openstack-lower-constraints-jobs

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

Change-Id: I0a19802c82c9ea9138a870559748063dca5507e1

.zuul.yaml

@@ -1,7 +1,6 @@
 - project:
     templates:
       - check-requirements
-#     - openstack-lower-constraints-jobs
       - openstack-python3-jobs
       - openstackclient-plugin-jobs
       - publish-openstack-docs-pti

lower-constraints.txt

@@ -1,76 +0,0 @@
-alabaster==0.7.10
-appdirs==1.3.0
-asn1crypto==0.23.0
-cffi==1.14.0
-cliff==3.5.0
-cmd2==0.8.0
-coverage==4.0
-cryptography==2.7
-debtcollector==1.2.0
-decorator==3.4.0
-deprecation==1.0
-docutils==0.11
-dogpile.cache==0.6.2
-dulwich==0.15.0
-extras==1.0.0
-fixtures==3.0.0
-httplib2==0.9.1
-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==3.2.0
-keystoneauth1==3.4.0
-linecache2==1.0.0
-MarkupSafe==1.0
-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.config==5.2.0
-oslo.i18n==3.15.3
-oslo.serialization==2.18.0
-oslo.utils==3.33.0
-oslotest==3.2.0
-pbr==2.0.0
-positional==1.2.1
-prettytable==0.7.2
-pycparser==2.18
-Pygments==2.2.0
-pyOpenSSL==19.1.0
-pyparsing==2.1.0
-pyperclip==1.5.27
-python-cinderclient==3.3.0
-python-glanceclient==2.8.0
-python-keystoneclient==3.8.0
-python-mimeparse==1.6.0
-python-mistralclient==3.1.0
-python-novaclient==9.1.0
-python-openstackclient==3.12.0
-python-subunit==1.0.0
-python-swiftclient==3.2.0
-pytz==2013.6
-PyYAML==3.13
-requests-mock==1.2.0
-requests==2.14.2
-requestsexceptions==1.2.0
-rfc3986==0.3.1
-simplejson==3.5.1
-snowballstemmer==1.2.1
-stestr==2.0.0
-stevedore==1.20.0
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-warlock==1.2.0
-wrapt==1.7.0

tox.ini

@@ -64,10 +64,3 @@ enable-extensions = H106,H203,H904
 ignore = H202,H405,H501,W504,H306
 show-source = True
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,releasenotes
-
-
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt