Dropping lower constraints testing from stable branches

This topic was discussed on the ML and QA team proposed to test
lower constraints [1]. As decided in horizon weekly meeting in
the past[2], stable branches will drop the lower-constraints job from CI.

[1]http://lists.openstack.org/pipermail/openstack-discuss/2020-December/019390.html
[2]https://meetings.opendev.org/irclogs/%23openstack-meeting-alt/%23openstack-meeting-alt.2021-03-24.log.html#t2021-03-24T15:12:58

Change-Id: I3f4367817cdf04eacacba8b2ba2bbc06b09d3132
(cherry picked from commit 38ccf26b17)
(cherry picked from commit e96945376c)
(cherry picked from commit 0b7a77e8a1)

.zuul.yaml

@@ -173,7 +173,6 @@
       - check-requirements
       - horizon-nodejs10-jobs
       - horizon-non-primary-django-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python-jobs
       - openstack-python3-train-jobs
       - periodic-stable-jobs

lower-constraints.txt

@@ -1,163 +0,0 @@
-alabaster==0.7.10
-amqp==2.1.1
-appdirs==1.4.0
-asn1crypto==0.23.0
-Babel==2.3.4
-bandit==1.4.0
-cachetools==2.0.0
-cffi==1.7.0
-chardet==3.0.4
-cliff==2.8.0
-cmd2==0.8.0
-colorama==0.3.9
-contextlib2==0.4.0
-coverage==4.0
-cryptography==2.1
-debtcollector==1.2.0
-decorator==3.4.0
-deprecation==1.0
-Django==1.11
-django-appconf==1.0.2
-django-babel==0.6.2
-django-compressor==2.0
-django-debreach==1.4.2
-django-pyscss==2.0.2
-doc8==0.6.0
-docutils==0.11
-dogpile.cache==0.6.2
-dulwich==0.15.0
-eventlet==0.18.2
-extras==1.0.0
-fasteners==0.7.0
-fixtures==3.0.0
-flake8==2.6.2
-flake8-import-order==0.12
-futurist==1.2.0
-greenlet==0.4.10
-hacking==1.1.0
-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==2.6.0
-keystoneauth1==3.4.0
-kombu==4.0.0
-linecache2==1.0.0
-MarkupSafe==1.0
-mccabe==0.2.1
-mock==2.0.0
-monotonic==0.6
-mox3==0.20.0
-msgpack-python==0.4.0
-munch==2.1.0
-netaddr==0.7.18
-netifaces==0.10.4
-nodeenv==0.9.4
-openstackdocstheme==1.20.0
-openstacksdk==0.11.2
-os-client-config==1.28.0
-os-service-types==1.2.0
-osc-lib==1.8.0
-oslo.concurrency==3.26.0
-oslo.config==5.2.0
-oslo.context==2.19.2
-oslo.i18n==3.15.3
-oslo.log==3.36.0
-oslo.messaging==5.29.0
-oslo.middleware==3.31.0
-oslo.policy==1.30.0
-oslo.serialization==2.18.0
-oslo.service==1.24.0
-oslo.upgradecheck==0.1.1
-oslo.utils==3.33.0
-osprofiler==2.3.0
-Paste==2.0.2
-PasteDeploy==1.5.0
-pbr==2.0.0
-pep8==1.5.7
-pika==0.10.0
-pika-pool==0.1.3
-Pint==0.5
-positional==1.2.1
-prettytable==0.7.2
-pycodestyle==2.0.0
-pycparser==2.18
-pyflakes==1.2.3
-Pygments==2.2.0
-pyinotify==0.9.6
-pymongo==3.0.2
-pyOpenSSL==17.1.0
-pyparsing==2.1.0
-pyperclip==1.5.27
-pyScss==1.3.7
-python-cinderclient==4.0.1
-python-dateutil==2.5.3
-python-glanceclient==2.8.0
-python-keystoneclient==3.15.0
-python-memcached==1.59
-python-mimeparse==1.6.0
-python-neutronclient==6.7.0
-python-novaclient==9.1.0
-python-swiftclient==3.2.0
-pytz==2013.6
-PyYAML==3.12
-rcssmin==1.0.6
-reno==2.5.0
-repoze.lru==0.7
-requests==2.14.2
-requestsexceptions==1.2.0
-restructuredtext-lint==1.1.1
-rfc3986==0.3.1
-rjsmin==1.0.12
-Routes==2.3.1
-selenium==2.50.1
-semantic-version==2.3.1
-simplejson==3.5.1
-six==1.10.0
-snowballstemmer==1.2.1
-Sphinx==1.6.5
-sphinxcontrib-websupport==1.0.1
-statsd==3.2.1
-stevedore==1.20.0
-tenacity==3.2.1
-termcolor==1.1.0
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-vine==1.1.4
-warlock==1.2.0
-WebOb==1.7.1
-wrapt==1.7.0
-XStatic==1.0.0
-XStatic-Angular==1.5.8.0
-XStatic-Angular-Bootstrap==2.2.0.0
-XStatic-Angular-FileUpload==12.0.4.0
-XStatic-Angular-Gettext==2.3.8.0
-XStatic-Angular-lrdragndrop==1.0.2.2
-XStatic-Angular-Schema-Form==0.8.13.0
-XStatic-Bootstrap-Datepicker==1.3.1.0
-XStatic-Bootstrap-SCSS==3.3.7.1
-XStatic-bootswatch==3.3.7.0
-XStatic-D3==3.5.17.0
-XStatic-Font-Awesome==4.7.0.0
-XStatic-Hogan==2.0.0.2
-XStatic-Jasmine==2.4.1.1
-XStatic-jQuery==1.8.2.1
-XStatic-JQuery-Migrate==1.2.1.1
-XStatic-jquery-ui==1.10.4.1
-XStatic-JQuery.quicksearch==2.0.3.1
-XStatic-JQuery.TableSorter==2.14.5.1
-XStatic-JSEncrypt==2.3.1.1
-XStatic-mdi==1.4.57.0
-XStatic-objectpath==1.2.1.0
-XStatic-Rickshaw==1.5.0.0
-XStatic-roboto-fontface==0.5.0.0
-XStatic-smart-table==1.4.13.2
-XStatic-Spin==1.2.5.2
-XStatic-term.js==0.0.7.0
-XStatic-tv4==1.2.7.0
-xvfbwrapper==0.1.3

tox.ini

@@ -30,12 +30,6 @@ commands =
   find . -type f -name "*.pyc" -delete
   bash {toxinidir}/tools/unit_tests.sh {envpython} {toxinidir} {posargs}
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-
 [testenv:venv]
 commands = {posargs}