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#proposal

Change-Id: I96aa562840823478139775fe33ea0f4ee495aef2
(cherry picked from commit ebd7334127)
(cherry picked from commit 096249b78a)
(cherry picked from commit b663961f1e)

lower-constraints.txt

@@ -1,15 +0,0 @@
-bandit==1.4.0
-coverage==4.0
-doc8==0.6.0
-oslo.i18n==3.15.3
-oslo.serialization==2.28.1
-oslo.utils==3.33.0
-oslotest==3.2.0
-pbr==2.0.0
-pylint==2.5.3
-python-subunit==1.0.0
-six==1.12
-sphinxcontrib-svg2pdfconverter==0.1.0
-stestr==2.0.0
-tenacity==5.0.2
-testtools==2.2.0

requirements.txt

@@ -1,3 +1,7 @@
+# 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

@@ -106,15 +106,6 @@ paths =
 [doc8]
 max-line-length = 79
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-whitelist_externals = sh
-commands =
-    sh -c 'OS_TEST_PATH={toxinidir}/octavia_lib/tests/unit stestr run {posargs}'
-
 [testenv:requirements]
 deps =
   -egit+https://opendev.org/openstack/requirements#egg=openstack-requirements

zuul.d/projects.yaml

@@ -2,7 +2,6 @@
     templates:
       - check-requirements
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python3-wallaby-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3