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: I094d6ff2c13847123ed31ddf1b93b7bfa4fe3b50

.zuul.yaml

@@ -1,6 +1,6 @@
 - project:
     templates:
-      - openstack-python3-ussuri-jobs
+      - openstack-python3-zed-jobs
       - check-requirements
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

lower-constraints.txt

@@ -1,39 +0,0 @@
-aodhclient==0.9.0
-Babel==2.3.4
-coverage==4.0
-doc8==0.6.0
-fixtures==3.0.0
-hacking==3.1.0
-keystoneauth1===3.18.0
-mistral-lib==2.3.0
-oslo.log==3.36.0
-oslotest==3.2.0
-pbr==2.0.0
-requests-mock==1.2.0
-stestr==2.0.0
-unittest2==1.1.0
-gnocchiclient==3.3.1
-oauthlib==0.6.2
-python-barbicanclient==4.5.2
-python-cinderclient==3.3.0
-python-zaqarclient==1.0.0
-python-designateclient==2.7.0
-python-glanceclient==2.8.0
-python-glareclient==0.3.0
-python-heatclient==1.10.0
-python-keystoneclient==3.8.0
-python-mistralclient==3.1.0
-python-manilaclient==1.23.0
-python-magnumclient==2.15.0
-python-muranoclient==1.3.0
-python-neutronclient==6.7.0
-python-novaclient==9.1.0
-python-senlinclient==1.11.0
-python-swiftclient==3.2.0
-python-tackerclient==0.8.0
-python-troveclient==2.2.0
-python-ironicclient==2.7.0
-python-ironic-inspector-client==1.5.0
-python-vitrageclient==2.0.0
-python-zunclient==3.4.0
-yaql==1.1.3

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.

test-requirements.txt

@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 hacking>=3.0.1 # Apache-2.0
-coverage!=4.4,>=4.0 # Apache-2.0
+coverage>=6.4.3 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0

tox.ini

@@ -72,9 +72,3 @@ show-source = True
 ignore = E123,E125,W504
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
-
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt