[stable-only] Cap virtualenv for py37stable/ussuri

py37 test started to fail with latest virtualenv (20.16.4) as it
bundles setuptools 65.3.0, which causes installation problems under
py37. (Note: with py38 the problem does not occur).

This patch sets virtualenv<20.16.4 to unblock the gate as
virtualenv 20.16.3 bundles setuptools 63.4.1, with which py37 gate
works well.

NOTE(stephenfin): Modified to remove the failing l-c job.

Change-Id: I8c457d06b79cacc770db62eac1d8e4459052d5ba

2 files changed, 4 insertions, 1 deletions

diff --git a/.zuul.yaml b/.zuul.yaml
index b0af3fe..53abc23 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -3,7 +3,6 @@
       - check-requirements
       - lib-forward-testing-python3
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python3-ussuri-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
diff --git a/tox.ini b/tox.ini
index 012bbad..c121592 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,6 +2,10 @@
 minversion = 3.2.0
 envlist = py37,pep8
 ignore_basepython_conflict = True
+# Pin setuptools via virtualenv as latest virtualenv pulls in 65.3.0
+# version of setuptools for py37, which causes installation problems
+# (virtualenv 20.16.3 uses setuptools 63.4.1).
+requires = virtualenv<20.16.4
 
 [testenv]
 basepython = python3