Drop lower-constraints testing

The OpenStack community consensus seems to be that it's not worth the
hassle of fixing. *Maybe* we can revisit this if we ever drop py2
support?

Reasonable spot to start on ML threads:
http://lists.openstack.org/pipermail/openstack-discuss/2021-January/019672.html

Change-Id: Ibf0c891782afe014cc453b713a94c187340d172e
Depends-On: https://review.opendev.org/c/openstack/requirements/+/777025
(cherry picked from commit 06b36ae0e2ee6054162bfb1d9f3cdda39eacbad5)

.zuul.yaml

@@ -23,6 +23,8 @@
     vars:
       # Override value from parent job to use swiftclient tests
       zuul_work_dir: "{{ zuul.projects['opendev.org/openstack/python-swiftclient'].src_dir }}"
+      # swift can use different tox env names
+      tox_envlist: func
 
 - job:
     name: swiftclient-functional-py2
@@ -36,7 +38,6 @@
     templates:
       - check-requirements
       - lib-forward-testing-python3
-      - openstack-lower-constraints-jobs
       - openstack-pypy-jobs-nonvoting
       - openstack-python-jobs
       - openstack-python3-ussuri-jobs

lower-constraints.txt

@@ -1,46 +0,0 @@
-alabaster==0.7.10
-Babel==2.3.4
-certifi==2018.1.18
-chardet==3.0.4
-coverage==4.0
-docutils==0.11
-dulwich==0.15.0
-extras==1.0.0
-fixtures==3.0.0
-flake8==2.2.4
-futures==3.0.0
-hacking==0.10.0
-idna==2.6
-imagesize==0.7.1
-iso8601==0.1.8
-Jinja2==2.10
-keystoneauth1==3.4.0
-linecache2==1.0.0
-MarkupSafe==1.0
-mccabe==0.2.1
-mock==1.2.0
-netaddr==0.7.10
-openstackdocstheme==1.20.0
-openstacksdk==0.11.0
-oslo.config==1.2.0
-pbr==2.0.0
-pep8==1.5.7
-PrettyTable==0.7.1
-pyflakes==0.8.1
-Pygments==2.2.0
-python-keystoneclient==0.7.0
-python-mimeparse==1.6.0
-python-subunit==1.0.0
-pytz==2013.6
-PyYAML==3.12
-reno==2.5.0
-requests==1.1.0
-six==1.9.0
-snowballstemmer==1.2.1
-sphinx==1.6.2
-sphinxcontrib-websupport==1.0.1
-stestr==2.0.0
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-urllib3==1.22

tox.ini

@@ -103,13 +103,6 @@ usedevelop = False
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -W -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
-[testenv:lower-constraints]
-basepython = python3
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  .[keystone]
-
 [testenv:pdf-docs]
 basepython = python3
 deps = {[testenv:docs]deps}